Aromatic Thai hot and sour soup with lemongrass, galangal, kaffir lime, and chili.
Central Thai, originally a fisherman's broth from the Chao Phraya basin where shrimp were abundant. "Tom" (ต้ม) means "boil," "yum" (ยำ) means "mixed" — the dish is built on layering aromatics into hot water rather than long stocks. The popular cream-cloudy version (tom yum nam khon) is recent — Bangkok hotels in the 1980s added evaporated milk for Western palates. Locals still drink the clear original (tom yum nam sai).
Lemongrass, galangal, kaffir lime — the aromatic trio that defines Thai sour-hot. Balance is everything.
A bright, almost-translucent broth scattered with prawn shells, mushroom, bird's-eye chili. The first sip is sour-spicy-aromatic at once — lime on the tongue, lemongrass and kaffir lime in the nose, chili building at the back of the throat. Meant to wake the appetite, not be drunk slowly.
Galangal — not ginger — is non-negotiable. The two look similar but galangal has a sharp, almost piney-medicinal aroma that defines tom yum's nose; ginger gives a pleasant but wrong soup. Kaffir lime LEAVES (not zest, not juice) are also essential. The chili paste (nam prik pao, fried with shrimp paste and tamarind) is what separates restaurant-grade tom yum from a home version that tastes thin.
Variations
Bangkok original is clear-broth (tom yum nam sai); the creamy version (tom yum nam khon) adds chili paste and evaporated milk (or coconut milk) and is a recent 1980s Bangkok innovation; modern Western Thai restaurants almost always make the creamy version — three broths.
On the Palate
Where Tom Yum sits in the Thai flavor cloud
Build a clear hot-sour aromatic broth by infusing whole aromatics into a gentle simmer, then adding fish sauce, lime, and herbs at the very end so the sour edge and fresh nose stay bright rather than boiling out.
Ingredients
How it's made
4 steps · 12 min
- 15 min
In a pot, bring the broth to a gentle simmer. Add lemongrass, kaffir lime leaves, galangal, and ginger. Let these aromatics infuse the broth for about 5 minutes until fragrant.
Watch outWatch for tiny lazy bubbles, not a rolling boil, and wait until the steam smells sharply of lemongrass and galangal before moving on.
- 24 min
Add the shrimp, mushrooms, and tomatoes to the pot. Cook until the shrimp are pink and the mushrooms are tender, about 4 minutes.
Watch outPull back the moment the prawns turn opaque pink and curl into a loose crescent; a tightly coiled ring means they are already overcooked and rubbery.
- 32 min
Stir in the fish sauce and chili peppers, tasting the broth for balance. Adjust seasoning as needed, simmering for another 2 minutes.
Watch outAdd fish sauce a splash at a time and taste after each — it is very salty, and you are chasing a savory backbone, not saltiness.
- 41 min
Remove the pot from heat and squeeze in fresh lime juice. Stir in chopped cilantro just before serving, ensuring the herbs remain vibrant and fresh.
Watch outThe pot should be off the heat and no longer bubbling when the lime and cilantro go in; the herbs should look vivid green, never wilted or dulled.
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