Cut off top of coconut with a sharp knife and keep the top that you have cut off. Take out the water. Scoop the soft flesh, and keep inside the coconut.
Mix the prawns with all the Ingredients and put back inside the coconut.
Seal the opening of the coconut with flour paste.
Put on the stove to over a low flame and keep cooking for 3 hours until the coconut becomes brown and burnt. Alternatively you can put the coconut inside a preheated oven at 200 0 C for 30 minutes.
Remove the flour paste covering, scoop out the prawns and serve with steaming rice.