Steam the papaya for approximately 5 minutes or until it is soft. Dry roast dried chillies and coriander seeds in a deep pan. Add onion and roast until golden brown. Add lemon grass, garlic and ginger along with some water and cook until the flavours are infused, for about 4-5 minutes. Remove the lemon grass and let the mixture cool. Blend this mixture with papaya. Add coconut milk/peanut milk, blend well and transfer back to the pan. Add salt and lemon leaves and bring to a boil. Serve piping hot.