Add straw mushroom. Cook for a few minutes more. Add chicken. Do not stir. Cook for 5 minutes or less until the chicken is cooked through – do not overcook.
Remove from heat. Season to taste with Thai fish sauce, lime juice and Thai chili pepper. Serve immediately with steamed jasmine rice.
Notes
Notes: Lemongrass, kaffir lime leaves, and galangal are used only for flavoring. Some people remove them before serving the soup. I prefer to leave them in the soup as long as you let your guest know that they are not edible.