Clean the fish and cut into pieces. Crush the garlic, onions and ginger together. Heat the oil and saute the crushed ingredients, then add chillie powder, turmeric powder, curry leaves, cocum, water and salt. When the water boils add the fish. When the gravy thickens remove from the stove.
Another method: Mix the crushed ingredients, chillie powder, turmeric powder, cocum, water and salt. When the water boils add the fish. Reduce heat and let it simmer. Before removing add fresh coconut oil and curry leaves. Prawns and tiny fish also can be used for both the dishes. For prawns, more water is needed.