I do them Portuguese style... pour a couple of cans crushed Toms, or a bottle of passata in to a frypan with a lid, lay slices of lemon over the top, put the Basa on top then more slices of lemon, (no stirring) put the lid on and put over a gentle heat till the fish is steamed. Serve the fish and spoon some of the lemony tomato over the top.