This is a simple yet tasty preparation for any kind of fish. This recipe calls for fillets, but traditionally whole fish would be used, since it is believed the head and bones give the most flavor.
Heat the oil in a deep skillet. Add the onion and cook until translucent. Add the garlic and sauté for 1 minute more. Add the chili pepper and sauté for 30 seconds. Add the tomato and curry leaves, and stir for 1 minute more. Add the curry powder and continue to cook, stirring often, for 1 minute.