Ingredients
Equipment
Method
- Bring 2 liters of water to a boil in a large pot.
- Add lemongrass, galangal, kaffir lime leaves, Thai chilies, and crushed garlic to the boiling water.
- Simmer the aromatic broth for 10 minutes to infuse the flavors.
- Add shrimp, oyster mushrooms, tomato wedges, and sliced onions to the pot.
- Continue simmering until the shrimp turns pink and is fully cooked, about 3-5 minutes.
- Stir in sugar, fish sauce, lime juice, and Thai roasted chili sauce.
- Add evaporated milk and stir gently to combine.
- Taste and adjust seasoning with additional fish sauce for saltiness or lime juice for sourness.
- Remove from heat and garnish with fresh chopped cilantro before serving.
Notes
Start with 8 tablespoons each of fish sauce and lime juice, then adjust to taste - the soup should be equally salty and sour
Bruise the lemongrass and chilies with the back of a knife to release more flavor
For a milder version, reduce the number of Thai chilies or remove seeds before adding
Galangal can be substituted with fresh ginger if unavailable, though the flavor will be slightly different
The aromatic herbs (lemongrass, galangal, lime leaves) are typically left in the soup but not eaten
For tom yum nam khon (creamy version), increase evaporated milk; for tom yum nam sai (clear version), omit the milk entirely
Fresh lime juice is essential - bottled lime juice will not provide the same bright, authentic flavor
