Preparation
1. Put water in a saucepan and bring to the boil.
2. Chop the lemon grass and galanga into 3cm lengths and add to the pot to make a soup base.
3. Pound the garlic and bird chillies and add into the soup.
4. Chop the chicken into bite sized pieces, then add to the soup and cook for 3 minutes.
5. Cut the straw mushrooms into half and add to the soup.
6. Add the fish sauce, salt, tamarind water, lemon juice, and kaffir leaves into the soup and cook for an additional 30 seconds.