1. Shell prawns. Remove instestines. Wash well. Apply salt and set aside.
2. Grind togeather red chillies, coriander, turmeric, garlic, cumin, ginger and coconut to a fine paste.
3. Slice onion. Heat oil and fry.
4. Add spices and fry.
5. Add water, slit green chillies and mango. Cook for five minutes and then add Cook till prawns.
6. Cook till prawns are done.