Ingredients

Equipment Needed

• •Heavy granite mortar and pestle (krok hin)
• •Wok (carbon steel preferred)

Instructions

1. 1

   Pound the kreung tam

   In a granite mortar (krok hin), pound the garlic and chilies to a rough paste. You want it broken, not smooth. Chunks of garlic should still be visible. Now add the kapi and pound it in until everything is incorporated, maybe ten more strikes. The smell will hit you. Fermented shrimp and raw garlic and crushed chili. That's the smell of a Southern Thai kitchen. If it doesn't make you flinch slightly, your kapi isn't strong enough.

   Southern kapi is darker, denser, and funkier than the lighter Central Thai versions. If you can find kapi from Ranong or Surat Thani, use it. The difference is like comparing aged cheese to processed cheese. Same category, completely different product.
2. 2

   Prepare the vegetables

   Wash all three vegetables and shake them dry. Cha-om leaves are tiny and feathery, growing off thorny stems. Pick the leaf sprigs from the stems, discard any woody bits. Water mimosa: snap off the tough lower stems where they resist bending, keep the tender upper portions and cut into 3-inch lengths. Morning glory: separate stems from leaves. The stems go in the wok first because they take longer. The leaves go in last. This sequencing matters.

3. 3

   Fry the paste

   Get your wok hot over high heat. Add the oil. When it shimmers, drop in the pounded kreung tam. Stir it fast for about fifteen seconds. The kapi will darken, the garlic will sizzle, and the kitchen will smell intensely of fermented shrimp and toasted chili. That's what you want. If you have dried shrimp, toss them in now and let them crisp for five seconds. They add a salty crunch that ties the whole dish together.

   Don't let the kapi burn. There's a fifteen-second window between 'toasted and fragrant' and 'acrid and bitter.' Watch the color. When it goes from purple-brown to a shade darker, you're there. Move on.
4. 4

   Stir-fry the vegetables

   Morning glory stems first. Toss them in and stir-fry for thirty seconds until they turn bright green and start to soften. Next, the water mimosa. Another twenty seconds. Then the cha-om sprigs and the morning glory leaves together. Ten seconds, tossing constantly. The cha-om wilts fast and its pungent, slightly bitter aroma will bloom the moment it hits the heat. That bitterness is the point. It's the taste of Southern Thai home cooking.

5. 5

   Season and serve

   Add the fish sauce and palm sugar. Toss twice. The palm sugar isn't here for sweetness. It's here to round the edges of the kapi's salt and the chili's heat. One teaspoon. No more. The South doesn't do sweet. Taste. The kapi and nam pla should give you a deep, savory salinity. The chilies should build heat at the back of your throat. The cha-om should be slightly bitter and pungent. If it all makes sense together, plate it. If the salt is shy, a splash more nam pla. Over jasmine rice. Done.

Chef Tips

• •Cha-om (Acacia pennata) is the vegetable that defines Southern Thai home cooking. It's pungent, slightly bitter, and sulfurous when raw. Cooking tames it, but the signature funk remains. If you've never eaten it, start with this dish. The kapi and chilies frame the bitterness so it makes sense. Don't substitute it with something milder. The whole character of the dish changes.
• •If you can't find all three vegetables, morning glory (phak bung) alone with the kapi kreung tam is still a legitimate Southern Thai stir-fry. Every market in Nakhon Si Thammarat sells phak bung pad kapi. Start there. Add cha-om and water mimosa when you find them.
• •Nam budu (น้ำบูดู), the Southern fermented fish sauce, can replace nam pla here for a more intensely funky, regional flavor. Budu is thicker and darker than standard fish sauce, closer to a condiment than a seasoning liquid. Use it sparingly if you go that route. A teaspoon of budu does the work of a tablespoon of nam pla.
• •Kapi quality is everything in this dish. There's no curry paste to hide behind, no coconut cream to soften the edges. The shrimp paste is exposed. Cheap kapi tastes like salt and nothing else. Good Southern kapi has depth: briny, funky, almost sweet, with a long finish. Find a Thai or Southeast Asian grocery that stocks the good stuff. It keeps indefinitely in the fridge.

Advance Preparation

• •The kreung tam can be pounded an hour or two ahead and left covered at room temperature. Kapi doesn't degrade quickly.
• •Vegetables should be washed, dried, and cut just before cooking. Morning glory and water mimosa oxidize and wilt fast once cut. Cha-om sprigs can be picked from stems and kept in a damp towel for a few hours.
• •This dish cannot be made ahead. Like all stir-fries, it lives in the thirty seconds between wok and plate. Reheated Southern vegetables are limp and sad. Cook it when you're ready to eat.

Frequently Asked Questions

Nutrition Information

1 serving (about 100g)