Method
- Peel and devein prawns, reserving shells and heads. Refrigerate the prawn meat. Toast the shells in a dry pot over medium-high heat for two minutes until they turn coral and smell sweet.
- Add water and bring to a boil. Skim the foam, lower to a simmer, and cook fifteen minutes. Strain through a fine sieve and discard the shells — this is your tom yum stock.
- Return the stock to the pot. Add lemongrass, galangal, torn kaffir lime leaves, and crushed chilies. Simmer eight minutes — the broth should smell unmistakably citrus-piney.
- Add the mushrooms and nam prik pao. Stir to dissolve the chili paste; the broth will turn a deep orange-red and gain a subtle smokiness.
- Add the prawns and fish sauce. Cook ninety seconds — pull off the heat the moment the prawns curl and turn opaque. Overcooking makes them rubbery.
- Off the heat, stir in the lime juice (boiling kills its perfume). Taste: it should land sour first, then salty, then a slow burn. Adjust with more lime or fish sauce. Garnish with cilantro and serve in a wide bowl with rice on the side.
Common questions
Can Tom Yum Goong be made ahead?
Tom Yum Goong is best made and eaten the same day, but the components can be prepped earlier — chop and measure the ingredients up to a day ahead, refrigerated separately. Final cooking takes about 15 minutes.
How spicy is Tom Yum Goong?
As written this recipe is medium-to-hot — typical of authentic Thailand cooking. To temper the heat, halve the chili or remove the seeds; to push it further, add more bird's-eye chili at the finishing stage. The spice can be adjusted at any point during cooking.
Is Tom Yum Goong vegetarian or gluten-free?
This recipe is naturally gluten-free as written.
How hard is Tom Yum Goong to make at home?
Tom Yum Goong sits at intermediate difficulty — total time about 30 minutes. The ingredients are not unusual but the timing requires attention.
Can Tom Yum Goong be scaled up or down?
This recipe is written for 4 servings. To scale, multiply each ingredient proportionally; the cooking times stay the same up to about double the volume. Beyond that, expect to cook in batches because of pan size and heat distribution.
Cultural Note
There are two main schools — tom yum nam sai (clear) and tom yum nam khon (creamy, with evaporated milk and more chili paste). Both are correct; both have fierce defenders. Tom yum is also a diagnostic: a Thai cook who can balance the four-flavour profile of this soup can balance anything. The fish-sauce-to-lime ratio is checked at the end, off heat, every time.
