Thai
Bruise the lemongrass and cut it into 4 cm pieces, slice the galangal and tear the lime leaves.
Bring the broth and half the coconut milk to a simmer with the lemongrass, galangal and lime leaves, and cook for 5 minutes.
Add the chicken and simmer for 8 minutes, until cooked through.
Add the mushrooms and the rest of the coconut milk and simmer gently for 3 minutes.
Take the pot off the heat and season with the fish sauce, lime juice and sugar.
Add the lightly crushed chilies, taste and adjust, and serve topped with cilantro.