Thai rotten bean sheets and sour spare rib soup with greens

I am back in Philly after a fulfilling two-week visit to Ulaanbaatar, Mongolia.  More posts are still to come on Ulaanbaatar/Mongolia food themes, but for now it is time to return to Philadelphia-based posts.

After coming back to the states, it was time to go shopping for Southeast Asian home-style ingredients. I went down to 7th street’s Friendly Market and happily found something I haven’t yet seen before in the US: “rotten bean” sheets (tua nao ถั่วเน่า/ຖັ່ວເນັ່າ) from Northern Thailand.


tua nao ถั่วเน่า found! Gusto Brand from 7th St’s Friendly Market. Packaging in English, Burmese ရှမ်းပဲ ပုတ်ပြား, and Lao ຖັ່ວເນັ່າ

Like many items at Friendly Market, this item is likely primarily geared towards Burmese audience, but of course, many flavors are regional and cross-border.  Northern Laos and Northern Thailand share a love of this unique food.  This is a fermented soy bean product similar in make to the perhaps better-known Japanese natto 納豆.

This version of tua nao is a little bigger than the kind we brought back from Northern Thailand last time we were there.  Here is an image of that package, and a size comparison between the two kinds:


You can see that the size, color, and consistency is a little bit different.

Thaifoodmaster blog has a nice introduction to this ingredient.  Check out that post here.

What kinds of things can you make with this?  So far, my repertoire is limited with this, but I know how to make a delicious soup with it.  The soup is a favorite in Northern Thailand, and it is called jau phakgaad จอผักกาด “boiled greens”.


jau phakgaad จอผักกาด, Northern Thai comfort food.

Andy Ricker’s recent Pok Pok cookbook has a good version of this recipe, called “Jaw Phak Kat” (by the way that whole book is excellent), although he assumes this tua nao ingredient unavailable in the US and suggests replacing it with Thai yellow bean sauce (see here for a blog post on that item from shesimmers.  You can also find this recipe online from Thai sources.  This is a nice step-by-step from Chiang Mai University.

Recipe: Jau phakgaad จอผักกาด “boiled greens”

This soup is straightforward enough.  The only hard part is preparing the ingredients.  The soup paste should be pounded first, and then the bean sheets need to be toasted and pounded.  Otherwise it’s a simple boil.


  • About 12 Thai dried chiles (6 for the paste and 6 for the end)
  • About 8 cloves of garlic
  • About 8 Asian shallots (of those 3 shallots for the crispy topping)
  • 1 T kapi (Thai fermented shrimp paste)
  • 2 lbs pork spare ribs, cut into individual ribs
  • 3/4 cup tamarind water
  • 1 sheet tua nao
  • 1 lb green leafy veg, usually Cantonese-style yu choy 油菜 is used, I used a gai choy 芥菜 more bitter mustard green
  • 1/4 thinly-sliced yellow onion
  • water
  • salt
  • fish sauce


1. Mash the paste, peppers, about 1 T salt, garlic, shallots, kapi.


1. starting the paste with salt and peppers

5 shallots are going in the mix too, along with these ingredients

five shallots are going in the mix too, along with these: garlic and kapi paste

3. Looking good.

finishing the paste. Looking good.

2. Cover spare ribs with water and bring to boil.  Skim the scum off and reduce to low heat.  Add paste.  Simmer for about 40 minutes, or until meat is tender.  Taste for saltiness, should be salty–add salt if it is not.


3. While ribs are simmering prepare fried crunchy shallots for topping.  Take the remaining shallots and slice them as thinly as possible. Heat about 4 T of vegetable oil in a small pot. This is not a simple fry on high flame. Care must be used to fry these on very low heat over about 15 minutes.  The result should be golden, dry, crispy shallots. My solution to not burning them was to use a heat diffuser under my pot on low heat. When the shallots are golden, strain them and lay on a paper towel.  Set aside.


About 12 minutes in and almost there.

4. lightly toast bean sheets over a flame (ideally wood fire coal).  The color will change a little.  Break up the sheet and pound to a powder.  Bring heat back up and add this into the soup.


A little uneven toasting on my part


ground tua nao, ready to put in the soup.

5. Prepare tamarind water, chop vegetables into 2″ lengths and wash, cut onion.

my gai choy, ready for washing and chopping

my gai choy, ready for washing and chopping

6.  Add in the vegetables and onions, along with the strained tamarind water.  Add in remaining whole chiles.

7.  Bring heat back down and simmer for 10 minutes or until the veg is just cooked.  Taste for seasoning.  If not enough flavor-saltiness, add fish sauce.

8.  Take off heat and top with crunchy fried shallots.

Eat together with steamed white rice or sticky rice.


About David Dettmann

Food obsessed and frequently nostalgic.
This entry was posted in - Featured Food Discoveries, - Featured Markets, - Recipes, Thai/Lao food and tagged , , , , , , , , , , , , , . Bookmark the permalink.

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