Remove seeds and cut tomatoes in small cubes. Coat a gratin dish with butter and preheat the oven to 180° - 200°. Cut pork fillet into medaillons and wrap round them with bacon. Put medaillons tightly packed into the gratin dish. Warm cream in a pot, stir in tomatoes, ketchup and tomato paste. Season to taste with garlic and spices and bring to the boil. Pour the sauce over the fillets and sprinkle with some butter flakes and breadcrumbs. Bake about 50 minutes in the oven.