Cooking Issues

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Our Friend Michael Batterberry Passes Away

July 31st, 2010 · Uncategorized

by Dave Arnold and Nils Noren

Michael listening to one of Dave's rants.

From Dave:

Michael Batterberry was a giant in the food world for over forty years. Long before we Americans were interested in what chefs were up to, Michael dedicated himself to improving the stature of that profession here.  Along with his wife Ariane, he founded Food and Wine Magazine, Food Arts Magazine, and wrote the definitive history of dining in New York. You can read about his life and  accomplishments here, and here. He went to great lengths to introduce people  he thought should meet, and he made forceful recommendations for people he believed in. He decided I was right for the FCI’s  Director of Culinary Technology position and cajoled the school into hiring me. I would not be who I am without him, and countless other people in this business can say the same thing. Michael was always searching for what was new –what was next. His eye was on the future but he had a deep appreciation for the past. His breadth of knowledge was staggering.


A few things the obituaries don’t mention: Michael was a sartorial wizard –the most dapper man I ever met. Despite always being the best dressed man in the room he was never, ever snobbish or stuffy. He could show up to a pig-pickin in a three piece suit and look perfectly at home. He had an amazing voice that easily held a room. His wit was sharp and dry but never biting. He was a great raconteur, but was also eager to listen.
Michael was gracious and generous and I am proud to be one of his protégés. I am sad I won’t see him again, but sadder for those who never got to meet him.

From Nils:
Michael was truly a great man in so many ways, and meant so much more to our industry the most people can comprehend. I personally have Michael to thank for many things. He gave me the chance to write, together with Dave, for Food Arts magazine, something I never thought I could really do. Michael was such a great visionary and when he spoke, you listened. His wealth of knowledge was so incredible. I never met anyone who knew more about the history of dining in this country and around the world, and who could also tell what the next big thing was going to be. Michael was opened minded and always curious about new things. He never dismissed new techniques or equipment. On the contrary, he  embraced them and he embraced progress, something I admired much.
I don’t know how many people in the food industry have Michael to thank for their success, but I know that there are a lot of us. There will be a huge void without Michael here, and we will miss him tremendously. But we will do everything we can to honor his memory. Skål Michael!

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Thank God for Potheads: New Favorite Tool in the Knife-Bag

July 27th, 2010 · Uncategorized

by Dave Arnold

You need to grind a small amount of spices and your mortar and pestle isn’t handy. You don’t want to clean out your pepper-mill. What are you going to do?  Those damn coffee/spice grinders do a crappy job on small quantities.  The spices just sit there under the blades.  You have to shake and shake –and still your spices don’t get ground. Potheads to the rescue.

Tech-savvy stoners use a device euphemistically called an “herb grinder” to crush marijuana into small pieces for use in devices like the volcano vaporizer.  Herb grinders are just two discs with meshing teeth.  Put something between the two discs, twist them in your hand, and viola –your product is ground. These grinders are small, simple, fast, and easy to clean –perfect to throw into your knife-bag.  We bought a plastic one and a metal one called the “chromium crusher” and put them through their paces with a variety of spices.

Two "herb grinders:" no-name plastic on the left; Chromium Crusher on the right.

1. Load the plastic grinder; 2. Twist away. 3. The Chromium Crusher at work.

I had high hopes for the chromium crusher.  I loved the look of the heavy metal monster. But the plastic device was the clear winner.  I think the geometry of the teeth is better in the plastic grinder; or perhaps the metal grinder’s teeth are just too far apart.

The Grinding Tests:

There are spices that grind well with an herb grinder, and spices that don’t.  I’ve divided them into the Good, the Bad, and the Ugly:

The Good:

In the photos below we have dried rosemary, lavender, and pepper. Both grinders, as you might expect, quickly pulverized the dried herbs. With the pepper you start to see the divergence between the plastic and metal grinders –the plastic grinds finer, as it did for all of the spices in our test.

Top to bottom: whole spice, plastic grinder, Chromium Crusher. Right to left, rosemary, lavender, and black pepper. All of these were easy to grind.

Both grinders also made short work of larger, harder spices, like cloves, allspice and star anise:

Top to bottom: whole spice, plastic grinder, Chromium Crusher. Left to right: cloves, allspice, star anise. These large, hard spices were also easy to grind.

The Bad:

Long thin seeds, like caraway and fennel seed, fared poorly.  I think they slipped between the teeth of the grinders.  Green cardamom seeds were just too small and hard to grind well.  The metal grinder did a slightly better job on the cardamom.

Top to bottom: whole spice, plastic grinder, Chromium Crusher. Left to right: caraway, fennel seed, green cardamom. Long, thin seeds just seemed to move around between grinder teeth without getting crushed. Super-hard cardamom seeds were just too-hard to grind.

The Ugly:

The plastic grinder ground soft round seeds, like mustard and coriander, marginally well; but left behind large pieces of skin that refused to grind any further.  The mustard seeds were a little too small for the metal grinder –it couldn’t crush them (coriander was okay).  Juniper was too wet and mucked up both grinders.  Everything but the juniper was easy to clean; the juniper was a royal pain.

Top to bottom: whole spice, plastic grinder, Chromium Crusher. Left to right: mustard seeds, coriander, and juniper. These soft round seeds worked, but not great. Juniper was just too wet and mucked up both grinders.

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Cocktail Class

July 26th, 2010 · Uncategorized

by Dave Arnold

Hello all.  I just got back from Tales of the Cocktail, the cocktail world’s booze-soaked yearly festival in New Orleans.  I will post about the seminar I was in, The Science of Stirring, very soon.  In the mean time, if you want to learn some techno-cocktail techniques, Nils and I are doing a class this Wednesday evening at the FCI in downtown New York.  See here. I figure half of the techniques will be stuff you can do at home –like clarifying lime juice; and half will be stuff you can’t –like rotary evaporation.  Expect liquid nitrogen.

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Simple Agar Clarification: 1 Year Anniversary, Plus a Rundown of Current Clarification Techniques

July 20th, 2010 · Uncategorized

by Dave Arnold

Lime Juice and Simple Agar Clarification.

Lime: the Holy Grail of clarification problems.

It has been a year since quick agar clarification changed my life.   I was looking for a way to clarify lime juice without the  help of  a $15,000 rotary evaporator or a $20,000 centrifuge.   Even if you have the equipment, these techniques produce only small quantities.  Simple agar clarification solved all my lime-juice problems, and more.  Read the post here.

Clarified lime juice.

Why is lime juice so hard to clarify?

  1. Lime juice can’t be heated much before it tastes cooked
  2. It must be very fresh — lime juice that is even a couple hours old tastes over-the-hill.  Freezing doesn’t prevent this deterioration, and neither does vacuum bagging.  Some of the big-kid flavor houses have made great strides in industrial fresh-lime taste, but ain’t nothing like the real thing, baby.  Most clarification techniques other than the traditional egg-raft take a lot of time — like days.

Why do I care about clarifying lime juice?

  1. Are you kidding?
  2. Gin and Tonics want lime juice, perfect G&T’s are directly carbonated (see here for video), and cloudy lime juice doesn’t carbonate well.
  3. Clear lime juice tastes incredibly clean
  4. Clear drinks look more pleasing than cloudy ones, and have a better texture

Simple agar clarification is, as the name suggests, simple.  It requires no special equipment, takes about half an hour, and can be done without overheating your juice (you hydrate the agar in boiling water and temper the juice back in).  Read last year’s post complete with instructions here.  In a nutshell: set your juice or whatever with 2 grams of agar per kilo juice. Break the gel up with a whisk.  Put the broken gel in three layers of cheesecloth.  Gently squeeze out the clear juice.

Some problems with simple agar clarification:

  1. It’s easy to over-squeeze the cheesecloth, which makes for cloudy juice.  I am pretty good at getting a high yield of clear juice with a technique I call “massaging the sack.”
  2. Juices that last for a couple of days (not lime) tend to get partly cloudy on the second day.  My guess is that some residual agar clumps together overnight.  Dunno for sure.

The bad news: I don’t have a way to solve these problems without some heavy duty equipment.  The good news: I can solve these problems with a *reasonably* priced centrifuge. The super-speed floor-model centrifuge of my early lime juice tests -  which can spin product at 48,000 times the force of gravity – costs well over $20,000, can blow apart if used improperly, holds only 500ml of juice, and is the size of a washing machine.  I bought a 3 liter bench-top centrifuge on eBay for about 300 bucks (granted, an unusually good deal). It is safe to use, holds 3 liters a a time, and is the size of two microwaves.  It can spin product at 4000 times the force of gravity –plenty of g’s  agar clarification.  Most centrifuges in this range can be equipped with 4 swinging buckets of 750ml each.   Don’t bother getting a smaller one or a larger one.  Read about our centrifuge here.

Modified fast (but not as simple) agar clarification technique: Instead of using cheesecloth,  break up the agar gel with a whisk, load it into the centrifuge, and spin it for 15 minutes at 4000 g’s.  Yield is very high,  no operator skill necessary, and the juice doesn’t re-cloud. I had used a similar, but not as effective, technique I called spin-gel clarification before I figured out the simple agar trick (post here); but I was too much of a bone head to combine the two techniques until very recently.

Here we demonstrate the technique on orange juice. First set the juice with 2 grams of agar per kilo of juice and let it gel. Second, break up the gel with a whisk.

Load the broken gel in centrifuge buckets and spin at 4000 g's for 15 minutes. Whammo! Clarified juice.

Left: clarified juice. Right: sludge from the bottom of the bucket.

Mini Primer: a Rundown of  the Clarification Techniques We Know:

People often ask me about different clarification techniques.  Here is a summary.

  • Egg raft: You know this one.
  • Filtration: I have not had much luck with filtration.  I have tried pressure filters, vacuum filters, different filtration media, etc. -  but have not been satisfied.  Even products with particles big enough to be filtered easily, like stock, tend to clog filters pretty quickly.  Chef Angel Leon has the clarimax filtration system – I haven’t used it yet.
  • Centrifuge on its own: You need a really fast one. Lime juice can only be directly clarified in a centrifuge when subjected to forces in excess of 27,000 g’s. To make sweet tasting clarified lime in a centrifuge you need 48,000 g’s. Wow.
  • Enzyme on its own: The cloudiness in certain juices, like apple juice, is stabilized by pectin.  If you add an enzyme that breaks down pectin, these juices self-clarify in the fridge (we use Novozymes Pectinex Smash XXL and Pectinex SP-L, which we also supply –see here).  The cloudiness settles to the bottom and the clear juice stays on top.  Pour off the clear juice and you’re done.  Be careful:  don’t stir up the particles at the bottom of your container; they will go right through a coffee filter. The problem with this technique is low yield;  the cloudy particles are suspended in a lot of good juice that never clarifies.  Thick purees don’t settle out in a reasonable amount of time. Read about the technique in depth here.
  • Enzyme plus Centrifuge: Unlike plain enzyme clarification, this technique can clarify thick purees like peach, nectarine, blueberry and strawberry. It also radically increases yield on thin juices like apple juice.  We no longer use enzyme clarification without the centrifuge.  The technique is simple: blend each kilo of whole fruit or juice with 2 grams of Pectinex SP-L and 1 gram of  Pectinex Smash XXL.  Allow to sit 20 or 30 minutes, then spin in a centrifuge at 4000 g’s for 15-20 minutes.  We get something like 80-95 percent yield depending on the solids content of the product.
  • Gelatin Freeze-Thaw Clarification: This was the first non-traditional clarification technique that chefs adopted.  It works on almost anything. Hydrate 5 grams of gelatin in every kilo of product.  Pour the mixture into 2 inch hotel pans (gastronorms for you Euro types). Allow the mix to sit in the fridge a while so the gelatin can do its thing (the liquid won’t gel at these concentrations) then freeze the mix solid.  Place a perforated 2 inch hotel pan inside of a 4 inch hotel pan and line the perforated pan with several layers of cheesecloth. After the mix is FULLY frozen, crack the ice-block out of the hotel pan (don’t use a torch) and put it into the cheesecloth-lined perforated hotel pan.  Let the ice thaw in the fridge.  What drips out will be crystal-clear.  Juices with a lot of pectin require less gelatin. Things like stock that have natural gelatin can be frozen and thawed as-is. If the stock has too much gelatin your yield will be poor.  Use a weak stock and reduce it later. Freeze-thaw clarified stock can be reduced a preposterous amount without becoming gluey, because the gelatin is gone. We made the meatiest tasting liquid of all-times using this technique — good stuff.  A curious fact about freeze thaw clarification: the liquid that thaws first in any batch is higher in sugar, acid, and color than the liquid that thaws last — so you can’t just use the first stuff that melts and save the rest for later–all the liquid from one freeze-thaw cycle should be batched together.   We sometimes intentionally concentrate flavor by only using the first half or two-thirds of the thaw, but some chefs (like Wylie Dufresne, who pioneered this technique with juices as opposed to stock) don’t endorse this  technique because the concentration changes the flavor balance (post on this subject here). The advantage of the freeze-thaw gelatin technique is that it works on almost anything.  The disadvantages are:
    • it isn’t vegetarian (not a problem for stock, but potentially a problem for juice)
    • if you don’t leave the gelatin long enough before you freeze it your product can go cloudy
    • if you don’t freeze the mix all the way through your product will go cloudy
    • if you let the product thaw in the kitchen and it gets too hot, it will go cloudy; if your fridge is too cold (ours runs at 32-34 F) it will take forever to thaw
    • even in the best of cases thawing can take a day or two.
  • Agar Freeze Thaw Clarification:the same as gelatin freeze-thaw, but with agar instead of gelatin. Use two grams of agar per kilo of product.  Make sure the agar boils for several minutes. If you don’t want to heat your product you can hydrate the agar in a small amount of water and then temper it into your product.  Make sure the agar/product mix doesn’t get below about 35-40C or it will gel prematurely. After the agar has been hydrated and added to your product, pour it into a hotel pan to set.  At 2 grams per kilo, agar will form a light gel. After the agar gels, proceed as for gelatin freeze-thaw.  The advantages of agar freeze-thaw clarification over gelatin clarification are:
    • it is vegetarian
    • it sometimes produces a clearer product
    • agar won’t melt, so the product can be thawed at room temp
    • if a portion of the agar doesn’t freeze, the gel will still hold and your product won’t become cloudy
  • Simple Agar Clarification: See the explanation above.  This is the only way to clarify lime juice properly.  It is also a good technique for when you need product quickly.
  • Simple Agar Clarification Plus Centrifuge: Simple agar clarification augmented with a centrifuge.  If you have a centrifuge, this is the best way to clarify in a hurry.

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Harold McGee Live on Cooking Issues Radio

July 19th, 2010 · Uncategorized

Cooking Issues will be live tomorrow at 12pm EST on the Heritage Radio Network  and special guest Harold McGee will be joining us via California.

We’re rolling him out of bed pretty early so please make him feel welcome and call in with your questions at 718-497-2128.  It’s a great chance for those of you who aren’t able to attend the McGee Lecture Series to speak to the man himself about your cooking issues.

Plus, we’re still giving away free pork to callers.

We’ll be live from 12pm-12:4pm EST. If you really can’t make it to a phone, email Nastassia directly at lopez.nastassia@gmail.com and we’ll answer as many as we can.

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The Spirit of Radio

July 12th, 2010 · Uncategorized

This week’s Cooking Issues radio show will be streaming live on the Heritage Radio Network tomorrow (Tuesday) from 12pm-12:45pm EST, so remember to call in with your questions at 718-497-2128.  It makes us happy to hear your voices.  If you can’t make a call, email questions to Nastassia at nlopez@frenchculinary.com and we’ll answer them in the order they come in.

Heritage has also created a link on iTunes for downloads of free Cooking Issues podcasts here.

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Giant Lobsters and Their Puny Brethren. Plus, A Wild Vegetable.

July 7th, 2010 · Uncategorized

by Dave Arnold

Fish joint in Truro, Ma.

This 4th of July weekend I visited family in the town of Truro on Cape Cod –lobster country. I stopped at a local fish and lobster shop and asked the owner how big his biggest lobsters were. The answer shocked me: twenty pounds. “Do you normally get 20 pound lobsters?” I asked him. “Yep,” he replied, “we sell ‘em all the time.”

One big lobster. This one weighs 20 pounds.

Now, conventional wisdom holds that large lobsters aren’t as good as smaller ones. They’re tough, we are told, and not as sweet. I have always maintained that there are no inherent large-lobster problems; they just need to be cooked and served properly. I have frequently enjoyed a six- or eight- pounder. Here was a chance to really put my large-lobster theories to the test, while also feeding six adults and two kids. I was excited to get started, but first I had to contend with a few issues:

The Morality of Eating Huge Lobsters:

There are two arguments against eating large lobsters:

1. Eating older animals is wrong because they have survived long enough to earn a pass; and
2. Killing large lobsters is detrimental to fishery conservation.

Let’s look at the first one. So just how old is a 20 pound lobster? The fellow in the Truro shop estimated 130 years. A similar age claim was made by PETA about a 20-pound lobster that they helped liberate from a New York City restaurant last year (read about George the Lobster here). These guesses are very inaccurate. They are derived from formulas that don’t work on older lobsters, like age=(weight in pounds)x4 +(3 years). There is no accurate way to determine a lobsters age based on weight. According to the best published accounts I could find, the upper known limit for lobster age is about 100 years and the heaviest on record is 44 pounds. A 20 pounder might be anywhere from 60-80 years old

Whether the lobster is 60, or 130, should advanced age preclude eating it? Why does age impart nobility? Newspaper articles about George the Lobster made statements like: “this lobster might have nibbled at the toes of the soldiers in Normandy.” The nobility, then, is a sentimental idea we attach to the animal based on a theoretical list of human experiences we think the lobster might have been party to. In reality, an 80 year old lobster hasn’t been getting smarter and smarter, and it hasn’t been following history. It has spent 80 years just being a lobster.

I decided the age issue was really not an issue at all. So how about conservation? Does eating a large lobster disproportionately impact the lobster population? The answer is yes, if the lobster is female. Lobsters get more and more fertile as they age. Unlike most animals, they just get randier and randier. Larger, older, females have vastly more eggs and can produce vastly more offspring than younger, smaller, lobsters. The very large lobsters for sale in Cape Cod – including the one I was eyeing — are taken by divers, not caught in traps, and are males.

I handed over my $139.

How to Cook It and Serve It Properly:
When large lobsters don’t taste as good as smaller ones it’s usually because they are overcooked. The Truro fish store, like many others, will cook lobsters for their customers. This store uses a convection steamer.

One of four steamers at the lobster store.

 Steaming is a good technique, heating large batches of lobster quickly and relatively evenly. I asked the store owner how long he would cook a 20 pound lobster. 45 minutes – Ouch. The outside of a lobster steamed for 45 would be hopelessly overcooked, but it probably would take that long to cook the center. So high-temperature cooking would not be an option. Unfortunately, long-time, low-temperature cooking is also not an option; Lobster meat turns to mush if it is cooked slow and low –the enzymes in the meat keep on working. I decided that the lobster shouldn’t be cooked whole. I would use a variant of the technique we use at the school: steam the lobster just long enough to kill it and set the meat (so the shell can be easily removed); cut the meat into pieces small enough to cook quickly; Ziploc-bag the pieces with butter (technique here); cook in simmering water until done.

Overcooking is only one of the dangers of large-lobster preparation. The second is improper butchering. As lobsters grow, their muscle fibers become thicker and coarser. If you take a bite out of a large lobster tail it might feel tough, because your teeth must shear many thick muscle fibers. Avoid this unpleasantness by slicing large tails into discs. Doing so limits the length of the muscle fibers and assures your teeth bite into the grain –not against it. I knew this technique from my previous experience with 6-8 pound lobsters. But now the trick was butchering the whole lobster, not just the tail, such that all the pieces would be cut across the grain.

The Cooking:
I couldn’t effectively par-cook the lobster in my mom’s equipment-challenged Cape Cod kitchen, so I convinced the shop owner to cook the lobster for 8 minutes in his steamer and then plunge the lobster into ice water to halt the cooking.

Picking up the par-cooked lobster.

The beast unwrapped.

After I picked up the par cooked beast I returned to my mom’s place to remove the meat. Even using metal shears, it was difficult to cut through the thick, tough shell.

One thick tough shell.

I removed the claws first. The claw joint knuckle meat was as big as a smaller lobster tail. I was pleased with the amount of par cooking I had requested, and I removed the claw meat intact. I butterflied the larger claw, and the smaller one I trimmed and basted in butter – I intended to grill that one for a little side-test.

Cutting the claw with metal shears, removing the meat, and butterflying.

A whole claw. I trimmed it for grilling.

I took off the tail, sheared the membrane off the bottom, and removed the meat with relative ease. I sliced the meat into thin discs.

Preparing the tail.

Cross section of the tail. You can see the texture of the meat in this shot. The thick fibers need to be cut across the grain to properly enjoy the meat.

Even the swimmerets on the bottom of the tail had meat in them. Below, right,  you can see the first swimmeret –the one that helps you determine gender. On the left,  the meat from the smaller legs:

Left: even the little legs had a lot of meat in them. Right: the first pair of swimmerets can be used to determine gender. These hard pointy ones indicate a male.

I dumped the fluids out of the body and reserved them. I ripped off the top of the carapace and removed the gills and gunk from the body. The body meat didn’t seem set enough to remove, so I cut the body in half.

Removing the gills and cleaning and prepping the body.

I bagged everything in butter. I cooked the body for 12 minutes, the knuckle meat for nine, the tail and claw meat for eight, and the leg meat for five. I didn’t time the grilled claw.  After the meat was done, I decanted the butter and juices out of the bags and put them into bowls for dipping.

Bag in butter, cook, serve.

I boiled the blood and tamale (the green gunk) in a pot because I didn’t have time to do anything more proper. It curdled and turned into a fluffy omelet-textured mass with a distinct lobster-ocean flavor surrounded by clear ocean-y brine. Ugly as hell but pretty darn delicious.

Body goop "omelet." looks terrible, tastes good.

The Result:

The cooked lobster meat.

The tasting panel consisted of me, my wife, my mom and stepfather, and two long-time family friends with whom I have eaten many a lobster. We all agreed that the meat was as sweet and delicious as any smaller lobsters we had eaten. We also agreed that the meat’s texture wasn’t tough, but was indeed different from young lobster meat. The claw meat fibers had the texture of pot roast. I preferred it to young lobster claw.

Cooked claw meat. The fibers come apart like pot roast --sweet lobstery pot roast.

The tip of the claw was akin to a rubber band, which no one enjoyed. The grilled claw was a revelation. The tail meat had a bit more bite than the meat from a smaller tail but was universally liked. The knuckle meat and leg meat were devoured instantly. The leg meat in particular was very sweet and umami filled –almost like crab meat. The body meat was a little mushy –maybe it took too long to get to temperature, maybe I cooked it too long in total. But it was still extremely sweet.

Conclusion:
Done properly, a large lobster is every bit as good as a small one. Maybe better.

Special Bonus: a Wild Vegetable

Around this time of year I usually go to an island in Maine that is a forager’s paradise. I posted about it here. I won’t make it this July, which is a real disappointment – there are few things I enjoy more than foraging in a place as rich as that island. But while on the beach in Cape Cod I noticed a bunch of wild sea rocket growing just above the high tide line. I was ecstatic!

Wild sea rocket. Notice the buds on the right.

Wild sea rocket is one of my favorite greens. Intensely pungent, juicy, a little bitter. This rocket, however, had developed flower buds, a phenomenon I had never seen before. Raw, the buds tasted a lot like the leaves. I picked a bunch of them and took them home, where I boiled them in salted water till tender.

Rocket buds.

They had the texture and feeling of edamame, and the taste and bitterness of broccoli rabe. Pretty cool. Next year I’ll boil them in three changes of water and sauté them with garlic and olive oil.

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Cooking Issues on the Radio

July 5th, 2010 · Uncategorized

Howdy readers!

The Cooking Issues radio show on Heritage Radio Network will be on haitus this week, so please save up your questions for next Tuesday’s show at noon (July 13).

If you can’t call us live, email Nastassia with your questions at nlopez@frenchculinary.com and we’ll try to get to as many as we can on air. 

In the meantime, listen to last week’s show here

-The Cooking Issues Team

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Stretch Today, Gone Tomorrow: Potato Ice Cream 2

June 30th, 2010 · Uncategorized

by Dave Arnold

We  love our stretchy potato ice cream. Read about it here.

Stretchy potato ice cream

Our interns enjoy dipping it in liquid nitrogen:

Here’s  the recipe.  We use sous-vide, but you can make this ice cream base traditionally, too.

Ingredients:

250 ml milk (cold)
250 ml cream (cold)
160 grams sugar (cold, if possible)
1.5 vanilla beans, scraped
2.5 grams salt
5 egg yolks (cold)
225 grams steamed peeled potatoes, cool
Liquid nitrogen

Preparation:

Combine milk, cream, sugar, vanilla scrapings, salt, and egg yolks in a blender.  Pour into a vacuum bag and seal at the highest vacuum you can muster without spraying anglaise mix all over your vacuum machine. Cook the base in a circulated bath at 82 C for 17-20 minutes.  Remove the base from the bath and smack the bag around a bit on the counter to smooth it out (we learned this technique from Joan Roca’s book, “Sous Vide Cooking”;  it is a really useful step). Chill the base in an ice bath.  Blend the base with the potatoes in a blender and freeze the mix with liquid nitrogen (see the liquid nitrogen primer) in a kitchen aid mixer fitted with a BeaterBlade attachment (see our other post).

People often ask us if our recipe would work with other starches or with naturally stretchy ingredients. Wylie Dufresne asked us to test the recipe with vital wheat gluten instead of potatoes. 

 

Wheat Gluten

 

We first tried a dose of 80 grams of wheat gluten in an anglaise base of 250ml milk, 250ml cream, 5 yolks, 100 grams sugar, and some vanilla.  It wasn’t stretchy, but it did show some promise, so we upped the gluten to 150 grams.  It tasted like frozen sweet bread dough ice cream. Not stretchy.  Potentially useful for a cookie dough like texture, but we weren’t huge fans.
We tried the same anglaise ice cream base with 80 grams of Ultrasperse 3 instantized agglomerated starch, made by National Starch.  No Stretch.

Upper left, wheat gluten --very dough-like. Upper right, Ultrasperse --not stretchy enough. Bottom, potato ice cream --the real deal.

A Call for Help! Stretchy Potato Ice Cream’s Texture is Fleeting:

We recently tested our recipe with potatoes that had been cooked the day before and stored in the fridge overnight.  The recipe didn’t work. WTF?  Starch retro-gradation?

Johnny Iuzzini tested our recipe and said that it loses its texture as it is stored in the freezer.  We haven’t noticed this problem, because we eat the stuff instantly.  Ideas, anyone?

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Manna Update: Candygram

June 29th, 2010 · Uncategorized

by Dave Arnold

I recently posted on manna, the stuff that God sent to the Israelites in the Bible.  You can read the post here, or read the New York Times article I wrote here.  Manna isn’t one single thing, it is a category of foods –sweet to the taste and providential in nature.  Most of mannas are the dried sap (or the honeydew excreted by bugs who eat the sap) of various desert shrubs.

Theorizing about exactly which shrub variety produced the manna in the bible is a favorite debate in some circles, and Tamarisk manna, from the Tamarisk tree, is often the top contender.

In Iran, tamarisk manna is know as Gaz.  It has been used for centuries to make a candy also known as gaz, whose primary ingredient is manna.  Most gaz candy today is counterfeit, but friend of the blog Kitchengrl (www.upstartkitchen.com) managed to send us the real deal.  This one isn’t from Iran, it’s from Iraqi Kurdistan.  Here is a picture of the box:

Tofiq Halwachy manna candy, outside of the box on left, inside on right. Photo courtesy of Kitchengrl.

And a closeup of the picture of the town inside the box:

The town where they make this stuff. Photo courtesy of Kitchengrl.

Here is the best part: the ingredient list, and a description of the history, uses, and gathering of manna:

This is a must read. It has some translation issues --like "john death" instead of "jaundice."

The candy is flavored with cardamom and pistachios, which balance well with the manna.  The most manna-like aspect of the candy is its texture –chewy, gummy, with a bit of a snap as it breaks.

The candy in its wrapper.

This photo shows the texture of the breaking manna:

You can guess the texture by looking at the way it breaks in this photo.

Great stuff.  Thanks Kitchengrl.

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