1. Shell prawns. Remove intestings and wash well.
2. Season and fry prawns, set aside.
3. Grind together half the onions and ginger to a fine paste.Slice the remaining onions.
4. Grate coconut and extracct coconut milk.
5.Roast and powder garam masala.
6. Heat oil, fry the sliced onions.
7. Add ground ingredients and turmeric and fry. Add garam masala, coconut milk, salt, sugar, treacle and prawns. Cook till prawns are done.