start by making tomato sauce, brown the onions, pancetta and garlic, seasoning with salt and pepper, then add the tin of tomatoes and bring to simmer, add the basil and turn off

seal the fish by frying it briefly on either side, then transfer it to an oven proof dish, pour over the tomato sauce and put mozzarella and parmesan over the top, place in a 200c oven for 10-15mins

this dish is good with both pasta and cous cous. you could add olives or anchovies to the sauce as well