Method
- Simmer shrimp shells in 6 cups water with lemongrass, galangal, and lime leaves for 20 minutes.
- Strain the broth, return to the pot, and bring back to a simmer with the smashed chiles.
- Add the mushrooms and shrimp and cook 3 minutes until the shrimp are just pink and curled.
- Off heat, season with fish sauce and lime juice, then garnish with cilantro and chile oil.
Cooks notes. Recipes are tested in a US home kitchen. Substitute lemon for lime if you must, but the result will read brighter. Salt to taste -- our quantities skew toward kosher.