Wash the fish and cut it into pieces. Apply 1 tsp of turmeric and salt according to taste keep aside. Grind 1 onion, 1/2 cup of grated coconut, 5 garlic cloves, 1'' ginger, 10 curry leaves in a very fine paste. In kadai add grinded paste and saute it for 2 to 3 minutes. Now add a pinch of asafoetida, 1 tsp turmeric powder,few curry leaves,two green chilly, 1/2 cup of fresh coconut milk,1 tomato along with 1/2 cup of water and bring it to boil. Mix it thoroughly till it starts to leave out the oil. Now add fish pieces to it and let it boil for 5-10 minutes. After adding fish do not over cook as the meat will separate from the bones!, without cover any lid cook the fish pieces. Once the fish pieces are cooked. Remove the kadai from the heat. Drizzle a teaspoon full of coconut oil and cover it. Serve with steamed rice.