1Cut lower portion of lemon grass into 1 inch lengths and crush.
Tear kaffir lime leaves in half.
Combine half the coconut milk with the broth, galangal, lemon grass and lime leaves in a large saucepan and heat to boiling.
2Add the chicken, fish sauce and sugar.
Simmer for about 5 minutes, or until chicken is cooked, then add remaining coconut milk.
3Heat just to boiling, add chili paste and lime juice, stir until blended.
Garnish with cilantro leaves and crushed chili peppers.
4NOTE: The galangal and lemon grass are for flavoring, not to eat! When I can't get fresh kaffir lime leaves at my local Asian market, I substitute kaffir lime powder. Fresh leaves, lemon grass and galangal can all be successfully frozen. I've also used minced lemon grass in a tube from the produce section. Powdered galangal is available, too. Fresh is better, of course!