Apply salt to fish and rinse it well. Drain thoroughly. Mix all the ingredients except oil. Apply to the fish. Keep this aside for 10 minutes. It absorbs flavors well.Heat a small pan with oil or ghee. When the oil turns hot enough fry it for about 3 to 4 minutes. Then flip it to the other side. Fry again till it is fried properly. Add curry leaves and fry until crisp. Drain to a kitchen tissue.Serve with onion wedges.