Directions:
Put all ingredients in a pressure cooker or a stock pot that can hold 2 liter of water
If using a pressure cooker, then pressure cook it for 20 minutes. Release the pressure then strain. You can use the thigh meat* in the main soup later, but discard the chicken carcass, lemon grass, garlic and ginger.
If using a regular stock pot, keep on boiling and simmer it for at least 1 hour. When done, strain as above.