- Place chicken stock in deep saucepan and bring to boil. Add the shallots, lemongrass and galangal and return to the boil.
- Add the prawns, mushrooms, kaffir lime leaves and chillies, then stir for 1-2 mins or until the prawns are just cooked. Adjust taste with fish sauce and lime juice.
- Serve the soup garnished with the coriander.