Heat the oven to 150°C/Gas 2. Cut the fish into large chunks. Using a small sharp knife, make an incision in each piece of fish and insert a broken piece of bay leaf. Arrange the fish in a wide, fairly shallow casserole dish and sprinkle with salt and plenty of black pepper.
Slice the tomatoes across thinly. Cut the pepper in half lengthways, discard the seeds and stem, and slice across