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Tom Kha Gai -- Thai Coconut Soup

Tom Kha Gai -- Thai Coconut Soup
A traditional and tasty Thai soup, this is my favorite comparison point between Thai restaurants and an excellent twist on chicken soup for cold winter days.  I'm a huge fan of coconut, chicken soup, and creamy soups in general, so it's a winner for me.

Of course, making it at home means I can customize it to my preferences.  It's surprisingly easy to make!  This recipe is loosely adapted from David Johnson's Thai Food, a brick-sized comprehensive guide to Thai cooking. 

Note that you can make a pescatarian version (fish stock, shrimp instead of chicken) or even vegetarian or vegan (veg stock, tofu for chicken, soy sauce for fish sauce) though the latter will lack some of the pungency that only comes with fish sauce.


 
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Step 1Tools and Ingredients

Tools and Ingredients
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This recipe scales beautifully - just multiply the ingredients below.  I've included substitutions for ingredients you may not have easily at hand, but a trip by an asian grocery will turn up everything on this list handily.  I buy lots of lemongrass and galanga ahead, then chop and freeze in pre-sorted ziplok bags for future use.  They keep quite well.  You can also do this with the shallots, coriander root, and kaffir lime leaves.

Broth:
1 can coconut milk
2-3 cups chicken stock (homemade is best, then the stuff in cartons; boullion cubes are a last resort.)
pinch of salt
1 teaspoon palm sugar (I usually substitute brown sugar)
2 stalks fresh lemongrass, washed and choppped in chunks (dried lemongrass is far inferior - punch it up with extra lime juice and zest at the end if you're forced to go this route)
3 red shallots, peeled and chunked (I often substitute 3 smashed cloves of garlic plus a bit of onion)
2 coriander roots, scraped (I usually substitute a pinch of whole coriander seed plus a handful of fresh coriander (cilantro) leaves)
2 chili peppers, halved (pick your favorite type, and modify number to suit your spice taste)
1.5 inch chunk of galanga root, chunked (ginger is in the same family, but tastes totally different - galanga TOTALLY makes the flavor of this dish.  If you can't get this locally, travel to a nearby city and visit the asian markets or scour the internets, buy a pound, then freeze what you can't use now.  It's a floral flavor that you'll definitely recognize if you've had tom kha gai before.)
3 kaffir lime leaves, coarsely chopped (I have a kaffir lime tree in my yard, but you can substitute lime zest if necessary.  It just won't be as fragrant and complex.)
1 teaspoon chili garlic sauce (optional, and kind of a cheat, but often good.)

Chunks:
1 pound boneless skinless chicken thighs, cut to 1" pieces (you can use breasts, but the thighs are moister and tastier)
1 cup chopped mushrooms (your choice - mix it up)
1-3 Tablespoons fish sauce (This stuff is pungent - if you're not familiar, add incrementally and taste before increasing.  But don't be turned off by the smell.  Definitely use some, as it's a key flavor that softens when you add it to the soup.)
1 can baby corn, drained and chopped to 1/2" chunks (optional)

Finish:
1 Tablespoon lime juice (more if compensating - see notes above)
1 handful fresh cilantro, chopped
1/2 cup grape tomatoes halved, or 2 plum tomatoes coarsely chopped (optional)

Tools:

1 large pot, at least 3 qt
knife
cutting board

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35 comments
Dec 19, 2009. 3:22 PMbas_van_abel says:
Fantastic recipe and great food photography! Looks so delicious. Last week we had an Instructables Restaurant try-out and your soup was served as well. The people loved it. They finished 20 liters in less than an hour!
Thanks for sharing this.
Jan 23, 2012. 11:13 AMbobbyd98682 says:
Thank you, thank you, thank you. I have been looking for a good Tom Kha Gai recipe and this one is fantastic! I made a double batch last night and all but one bowl for lunch today was voraciously consumed. I was wondering, have you or anyone else made the broth beforehand and then froze it for later use? I'm going to try this but I don't want to waste this delicious ambrosia.
Dec 2, 2011. 10:18 AMjpetty1 says:
why is this in the vegan section???????
Lol. =:P
Oct 12, 2009. 8:00 AMmostkillingest says:
About how long did it take to cook the chicken? I just want to gauge average time to prepare.
Nov 12, 2011. 6:52 PMbillwscott says:
I cut the chicken into thin strips and it cooked in about 5 minutes. But generally for any Thai curries I have cooked cubed chicken for about 10 minutes and it is perfect.
Nov 12, 2011. 6:48 PMbillwscott says:
I made this today. First time with Tom Kha. It was nothing short of amazing. I added 1/2 can coconut milk to give it a richer flavor (1 1/2 total) and doubled the palm sugar.
Oct 6, 2011. 10:38 AMtoetoucher says:
the restaurant that i have eaten at describes the soup with sweet tamarind-cury flavor....What is this?
Jul 16, 2011. 7:01 AMpcianci says:
The first time I tried attempted to try this soup, I could not even bear the "smell"! However, after trying it (years ago) I became obsessed with this soup; it is so freaking good! In fact, I judge Thai restaurants by the quality of their Tom Kha Gai soups. If they are watered down, forget it! A good soup like this must be creamy with all the ingredients/flavors bursting in your mouth that creates an outer body experience lol. I think I'll make some today!!! Great comments and suggestions here - thanks!
Sep 29, 2011. 3:10 PMhamsolo says:
I just made this last night... glad I found your instructable!

One thing I did that made the stock step a bit easier was to put all of the 'non-edibles' into a sachet. That made separation of the galanga, lemongrass and lime leaves possible while keeping the serranos, garlic and shallots in the soup for added texture.

Thanks so much for posting this... I'm a hero in my kitchen now, thanks to this (it's my girlfriend's favorite soup).
Oct 10, 2009. 7:59 AMRomado12187 says:
now all you have to do is make a coconut bowl to serve it in
Sep 28, 2010. 4:41 AMOlgaAlexa says:
Thank you for this beautiful recipe! How much do you get though, as in serves? Thank you!
May 5, 2010. 5:45 PMpimpinyams says:
I really enjoyed this version. Everything complimented each other and the aroma was just awesome. I followed everything except for the corn, tomato, and the Kaffir leaves (could not find the leaves). I grated a whole lime instead. I added a little bit more brown sugar at the end to suite my taste and sliced the chicken into very thin strips. Everyone has his or her own tastes. As a recipe untouched, I think it is well balanced. Thanks a lot for adding your own suggestions and options as many don't.
Oct 9, 2009. 9:00 AMNinzerbean says:
 Oh oh oh I love this soup, thank you ever so, I can't wait to try yours - do you have favorite brand of fish sauce? Does it matter? Whenever I think I am going to get sick I order this soup, extra hot, and I don't end up getting sick.
Jan 11, 2010. 5:54 PMKwitmeh3 says:
squid brand is a good Thai one, but not as light as the Vietnamese fish sauce
Oct 11, 2009. 2:57 AMmdeblasi1 says:
Canida
You may be interested in this comparison of fish sauces. 
its not Thai, it's Vietnamese, but I used it and found it to be perfectly good.
Dec 8, 2009. 6:49 PMtabbique says:
In "Nourishing traditions" author Sally Fallon shows you how to make your own fish sauce, and how wonderfully good it is for you!
Oct 13, 2009. 5:25 PMyerfdog123 says:
3 crabs is the best in my opinion. i know this because, welll, my mom's thai so i have an advantage. :D
Oct 14, 2009. 4:27 AMNinzerbean says:
I went to my local Asian market yesterday and asked the owner, who Ihave come to be pretty friendly with over the years, and she took meright over to 3 crabs and told me it was so nice you could use it plain,that the brand I have been using for years (Squid) is much more salt andmuch less fish. Thank you for your input.
Oct 25, 2009. 12:12 PMJayefuu says:
That looks amazing, I love Thai food.
Oct 21, 2009. 6:24 PMLittleRaisin says:
double double thumbs up! :)
I made this as a demonstration in my foods class and only one snoody dumbass didn't like it heh. 
Oct 10, 2009. 7:56 AMRomado12187 says:
!
Oct 10, 2009. 3:03 AMPatrik says:
Ah... Tom Kha Gai, one of my favorites!

I would definitely leave out Step 3 though. Actually, the more "inedibles" (galangal, lemongrass, kaffir leaves) in the soup the better, in my opinion. I've been known to stop frequenting a thai restaurant after finding out their tom kha gai was just some watery coconut broth with a few slices of mushroom and a fleck of cilantro - ugh!

In fact, I love chewing on some of those inedible to get that last burst of flavor out of them. Fresh galangal is quite edible if sliced finely enough, just like its better known relative: ginger. Not quite as intense, but just as jummy. Lemongrass will leave you with a wad of fiber in your mouth though, but it's well worth it for the flavor.

Then again, I do like playing with my food... :-D
Oct 9, 2009. 8:58 AMJayefuu says:
I SHALL be making this. I love spicy asian soups. I have a brilliant spicy chicken noodle soup I keep meaning to instructablise. This is 10x better since it has corriander in it. <3 corriander
Oct 9, 2009. 5:41 PMJayefuu says:
Okay, I'll do it soon. Expect a link on your orange board.
Oct 8, 2009. 7:30 PMcowscankill says:
Mmm... Looks good!
Oct 9, 2009. 6:17 AMjessyratfink says:
I have almost everything on hand - I think I'll need to try this.

Beautiful food porn, too! :D

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I've been posting Instructables since the site's inception, and now run Community and Marketing. Follow me for food and more!