Carrot Caviar by mzed
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carrot_martini.jpg
There is a movement in the cooking world called "Molecular Gastronomy." The term was coined by Herve This, and become associated with chefs like Ferran Adria at El Bulli, Wylie Dufresne at wd~50, Grant Achatz at Alinea, and Homaru Cantu at Moto. Here is an interesting article in the New York Times.

Essentially, it involves applying scientific techniques and methodologies to the cooking process. One of the interesting results is found in the use of common substances to control the texture of foods, often in surprising ways.

You don't need a chemistry lab to pull off such effects. Jump on board the Molecular Gastronomy train by making up some carrot caviar in your own kitchen.

Here's a quick video of me making Carrot Caviar at Maker Faire 2008:


 
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Step 1: Assemble your tools and ingrediants

Round up a few bowls and a strainer in your kitchen. In addition, you need some more unusual gadgets:

A Very Accurate Scale
I chose this one. My criteria were 1) It is accurate to 0.1 grams, and 2) It looked more like a kitchen scale than a drug scale. It also had a bunch of nice features (counting, for instance) that I may never use.

Immersion Blender (optional)
You can use a regular blender, but the immersion version is nice because you get less air whipped into your solution.

Syringe (optional)
I got these the same place I got the chemicals (below). I have also heard of people using traditional squirt bottles, like the red and yellow ones that are traditional for ketchup and mustard. The syringe makes me feel more like a real chemist.

For ingredients, you will need:

250 g Carrot Juice ( some nice Odwalla Juice from the local store)
500 g Water (from my local tap)
2.0 g Sodium Alginate
2.5 g Calcium Cloride

These last two are both a bit unusual. I ordered from Le Sanctuaire, which is based in San Francisco. There are other suppliers, like Texturas (Europe), L'Epicerie (in the US). L'Epicerie has a fabulous looking pipette for making cavier on an industrial scale.
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n8man says: Nov 16, 2008. 6:32 PM
Cool instructable. One question, could you do this with other juices like strawberry, blackberry, or orange?
mzed (author) says: Nov 17, 2008. 1:43 PM
Yes, although more acidic juices are tricky. With other juices, I've used sodium citrate to contral acidity.
n8man says: Nov 17, 2008. 4:35 PM
What about carbonated juices?
bpersun says: Sep 20, 2012. 10:36 AM
http://www.molecule-r.com/en/content/58-molecular-cuba-libre
sromes1 says: Feb 6, 2012. 8:20 AM
btw...thats how they make synthetic seeds as well using sodium aliginate or similar substances to cover plant embryos .
abeazley says: Jul 19, 2011. 3:58 PM
Where did you get your calcium chloride and sodium alginate?
mzed (author) says: Jul 19, 2011. 4:20 PM
I got them at Le Sanctuaire, here:

http://www.le-sanctuaire.com/index.html

Probably not the cheapest, but local to me. You could also try here:
http://www.willpowder.net/sodiumAlginate.html

or even Amazon.
CreativeChick8 says: Jul 2, 2011. 8:55 AM
Oh dear lord.
In the middle of doing this right now.
DEFINITELY not as easy as it seems.
HannahLegutki says: Dec 29, 2010. 2:10 PM
THis is awesomee!! and Btw, did anybody else notice the boy at 2:12 in the video...? haha
xenobiologista says: Dec 23, 2010. 11:03 PM
I think the new "Passionfruit Pop Boba" at the Each A Cup bubble tea chain in Singapore are basically this stuff. I had some yesterday and they're awesome. Thanks for the recipe, will try making some at home if I can locate the alginate for a reasonable price.

By the way, as a biologist I'm very amused to see a 96-well multichannel pipette for kitchen use...
rand0mmm says: Nov 22, 2010. 1:32 PM
Made the carrot style, Worked Great! Did a careful measure as recommended, tho we made half the amount. Also, we added alginate to the carrot with a small battery whisk running keeping it agitated. No problems, except for cleaning out 5% of the 96 little pipettes that clogged.
carpfluff says: Apr 10, 2010. 5:46 PM
that's very disturbing... considering that carrots don't have eggs.
SpiderFarmer says: Jan 28, 2008. 10:10 AM
I did something similar last week with coffee, to make Sumatra caviar.

A full set of pics and instructions is here, and here's a pic of the final result:

Among the differences in our technique was that I heated the alginate mixture, which was according to the recipe I was following, but also I used hot liquid, which as it turns out, was probably not the best of ideas.

Also, I did my measurements in standard U.S. cooking measures (teaspoons, tablespoons, cups, etc. just because it was easier than breaking out the real scale.)

That said, with a little improvisation (and some added chocolate) the resulting coffee caviar turned out fairly well for a first try.
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Dig-Doug says: Mar 27, 2010. 5:17 PM
nice.
gustavo.leal says: Apr 18, 2009. 5:49 AM
(removed by author or community request)
amar55in says: Apr 27, 2009. 11:27 PM
hey can u give the recipe of using sago.I mean PLEASE !!?
mzed (author) says: Apr 28, 2009. 8:16 AM
Sodium Alginate is tasteless
Dig-Doug says: Mar 27, 2010. 5:14 PM
the sago variation does not leave a juicy center, instead it just gelatinizes the entire thing.
phycoinventer says: May 11, 2009. 2:58 PM
OK so I tried this. granted I didn't measure everything perfect, but I just wanted to test first. I used grape juice instead of carrot juice. I put the alginate in the juice, the cal chloride (it's cheap at a beer making store) in the water, and then just water. when I driped the juice mix in the cal clor it just disputed, no ball, or form. I tried adding more alginate and cal chor to see if I was just too low. will that happen if the mix is off? please help, aright me at phycoinveter@gmail.com
Dig-Doug says: Mar 27, 2010. 5:11 PM
The problem with molecular gastronomy is that sometimes you have to be really precise. I suggest 200 g of water to 2.0 g of sodium alginate to achieve the ideal molarity for the solution. Also, you have to take in account that grape juice has a much higher pH level than carrot juice does. I don't know if that is a factor, but a difference in pH can either cause the sodium alginate and calcium chloride to create a salt lattice bond, or not. Pay attention to the concentrations in your solution. And if the acidity does pose a problem, nuetralize the grape juice with a base, also buy some pH strips. And don't dip them into the solution, as they will leave a strange taste, rather drop the nuetralized grape juice onto the ph strip.
Darrick says: Jul 9, 2009. 10:14 AM
Most likely its the fact that you added alginate to the juice. its the opposite, adding juice to the alginate. (Take a look at the video)
greenmia says: May 13, 2009. 10:14 PM
It might be the grape juice...
ampeyro says: Aug 30, 2009. 1:59 PM
please, can you post the european suplier again? the link is broken
bad ass pope says: Mar 19, 2010. 7:41 PM
I just Googled it. I think it's this: www.albertyferranadria.com/index-eng.html
MadBricoleur says: Oct 27, 2009. 6:51 PM
Mmmm. Delicious, edible, not to mention homemade

paintballs :D
raimen says: Jun 28, 2009. 2:03 PM
could you do this with other types of juices, or just carrot?
*thinks of the limitless possibilities* :D
Azayles says: Jun 22, 2009. 6:59 PM
I'm thinking you could mix up some, oh I dunno, raspberry juice or something, then fold it carefully into some melted chocolate and when it sets you'll have chocolates with "explode in the mouth" raspberry bubbles :-D
phenoptix says: May 14, 2009. 7:29 AM
Thanks for the instructable, I thought this was how el bulli did it. I remember making yeast in alginate in biology at school to. I think melon caviar is quite a popular variation although I'll definitely try this carrot version as well as the coffee version as below. Cheers!
GorillazMiko says: Jun 29, 2008. 11:48 AM
Woah. Zbyszynski. My name is Michael too! :P
mg0930mg says: Nov 17, 2008. 5:51 PM
Mine too!
Sandisk1duo says: Nov 16, 2008. 6:21 PM
It isn't toxic, right?
mzed (author) says: Nov 17, 2008. 1:41 PM
not toxic
Sandisk1duo says: Nov 17, 2008. 3:28 PM
ok
RichardBronosky says: Jan 24, 2008. 9:00 PM
Cooking Science? All I have to say about that is "Alton Brown".
DesignerUserName says: Oct 23, 2008. 11:35 PM
Yay!!
codongolev says: Oct 13, 2008. 4:12 PM
I like the kid randomly popping into frame in the video.
Ward_Nox says: Mar 16, 2008. 1:28 PM
has anyone tried chocolate syrup yet?
jdills1196 says: May 30, 2008. 2:22 PM
Lol why dont you?
death_match says: Mar 16, 2008. 11:54 AM
WOW I did this in school for a science project but I never knew it was edibal !! now im a chef I couldn't be more happy! hummm I can feel my creative juices flowing !! you made my day! thanks
recon506 says: Feb 7, 2008. 7:41 PM
if you substitue soy sauce for the carrot juice will the amounts still work? also, id love the amounts in proportions so that i dont have to use a scale
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