Wash the potatoes and boil in water for about 20 minutes. Drain the tomatoes. Cut the flesh into small pieces
Wash, dry and dice the fillets. Fry in hot oil all around for about 5 minutes. Season. Mix cream, stock and contents of the bag. Pour over the meat, fold in tomatoes
Quench the potatoes and remove the skin. Let the potatoes cool down a little. Peel garlic and cut in half. Rub the casserole dish with garlic, then grease
Drain the mozzarella. Cut the potatoes into slices and place them in flakes on the edge of the mould. Fill fillets and sauce into the middle. Cut mozzarella into slices and place on top. Bake in the preheated oven (electric cooker: 200 °C / convection oven: 175 °C / gas: level 3) for about 20 minutes. Sprinkle with herbs if necessary