Ingredients

• 2 stalks fresh lemongrass, tough outer layers removed
• 1 1" piece ginger, peeled
• 10 kaffir lime leaves, or use 1 tablespoon lime zest and 1/4 cup lime juice
• 6 cups low-sodium chicken broth
• 1 1/2 pounds skinless, boneless chicken thighs, cut into 1" pieces
• 8 ounces shiitake, oyster, or maitake mushrooms, stemmed, caps cut into bite-size pieces
• 1 13.5-ounce can coconut milk
• 2 tablespoons fish sauce
• 1 teaspoon sugar
• Chili oil, cilantro leaves with tender stems, and lime wedges (for serving)
• N/A cilantro leaves with tender stems
• N/A lime wedges

Instructions

1. Using the back of a knife, lightly smash lemongrass and ginger; cut lemongrass into 4" pieces. Bring lemongrass, ginger, lime leaves, and broth to a boil in a large saucepan. Reduce heat and simmer until flavors are melded, 8-10 minutes. Strain broth into clean saucepan; discard solids.
2. Add chicken and return to a boil. Reduce heat, add mushrooms, and simmer, skimming occasionally, until chicken is cooked through and mushrooms are soft, 20-25 minutes. Mix in coconut milk, fish sauce, and sugar.
3. Divide soup among bowls. Serve with chili oil, cilantro, and lime wedges.