tom yum soup recipe

Ingredients 4 cups chicken broth 2 stalks lemongrass, cut into 2-inch pieces and smashed 3-4 kaffir lime leaves, torn into pieces 3 slices galangal (or ginger if unavailable) 2-3 Thai chilies, smashed 1 cup mushrooms, sliced (straw or button mushrooms) 1 lb shrimp, peeled and deveined 2 tomatoes, cut into wedges 1 small onion, sliced 2-3 tablespoons fish sauce