Clean and gut fish. Make slashes on the fish on both sides and place on a piece of aluminium foil.
Mix soy sauce, fish sauce, sugar, chilli sauce, black pepper, lemon juice and garlic in a small bowl. Stuff the fish with lemon slices and cilantro. Pour about a tablespoon of the sauce on each side of the fish. Close the foil to form a tent.
Bake for about 20 minutes. Open the tent and broil for about 8 - 10 minutes.