Thai Isaan Sour Pork Rib Soup

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A rustic and boldly flavored soup from northeastern Thailand, this Isaan-style pork rib soup balances intense heat, bracing lime acidity, and aromatic fresh herbs. The slow-simmered ribs create a cloudy, collagen-rich broth that locals traditionally enjoy with a basket of warm sticky rice and a plate of raw vegetables on the side.

Nutrition Facts

Per serving (estimated)

• 480 kcalCalories
• 35 gFat
• 13 gSaturated Fat
• 9 gCarbs
• 2 gFiber
• 3 gSugar
• 32 gProtein
• 1050 mgSodium
• 720 mgPotassium
• 90 mgCalcium
• 3.5 mgIron
• 38 mgVitamin C
• 25 mcgVitamin A

Ingredients

For the Tom Saap paste

• 8 dried Thai long chilies, stems removed
• 6 small shallots, peeled
• 5 cloves garlic
• 1 (2-inch) piece galangal, sliced
• 2 stalks lemongrass, white part only, sliced
• 3 cilantro roots (or stems), scrubbed

For the soup

• 2 lb pork spare ribs, cut into 2-inch pieces
• 8 cups cold water
• 1 large tomato, cut into wedges
• 3 tbsp fish sauce, plus more to taste
• 1 tsp shrimp paste (kapi), wrapped in foil and grilled 2 minutes
• 3 tbsp fresh lime juice, plus more to taste
• 6 Thai bird's eye chilies, lightly smashed
• 1 cup fresh dill, roughly chopped
• 1/2 cup sawtooth coriander (culantro) leaves
• 1/4 cup Chinese celery leaves
• 1 tsp fine sea salt

Directions

1. Soak the dried chilies in warm water for 15 minutes until pliable; drain well and roughly chop.
2. In a mortar and pestle (or small food processor), pound the soaked chilies, shallots, garlic, galangal, lemongrass, and cilantro roots into a coarse, fragrant paste, about 5 minutes.
3. Place the pork ribs in a large heavy pot, add the cold water and Tom Saap paste, and bring to a boil over high heat. Skim any gray foam, then reduce to a steady simmer.
4. Simmer uncovered for 35-40 minutes, until the ribs are tender and the broth has turned a cloudy, pale golden color from the rendered collagen.
5. Add the tomato wedges and grilled shrimp paste; simmer 3 more minutes until the tomato softens but still holds its shape.
6. Season the broth with fish sauce, salt, and lime juice. Taste and adjust aggressively — authentic Tom Saap should be intensely sour, salty, and spicy all at once.
7. Stir in the smashed bird's eye chilies, dill, sawtooth coriander, and Chinese celery, then immediately remove the pot from the heat so the herbs stay bright green and aromatic.
8. Ladle the soup into bowls making sure each portion gets a generous share of ribs, tomato, and herbs. Serve piping hot with sticky rice and a side of raw Thai eggplant, long beans, and cabbage.
9. Provide extra fish sauce, lime wedges, and dried chili flakes at the table so each diner can dial up the salt, sour, or heat to their liking.

Cook’s Notes

• Choose meaty pork spare ribs or country-style ribs for the richest broth; lean cuts will not yield the same cloudy, full-bodied result.
• Grilling the shrimp paste before adding it deepens the savory umami backbone — this is a signature Isaan touch worth the extra step.
• Do not be timid with the lime and chilies; Tom Saap is defined by its bold sour-spicy punch, not by subtle balance.
• Always add the delicate herbs off the heat just before serving to preserve their vivid color and bright aroma.
• Traditional accompaniments include steamed sticky rice (khao niao) and raw vegetables such as Thai eggplant, long beans, and winged beans to balance the heat.

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