Soak rolls in cold water. Peel and chop the onion. Mix minced meat, egg, squeezed out roll and onion. Season with salt and cayenne pepper. Form 6 meatballs with a rim, pressing a hollow in the middle of each.
Place in a greased mould. Finely chop the olives for the filling. Peel the garlic and press it through a garlic press. Wash and chop the oregano. Mix the prepared ingredients and fill into the wells.
Wash and slice the tomatoes. Place one slice on each of the meatballs. Put the rest of the tomato slices in the tin. Grate cheese over the tomato slices. Cook in the preheated oven (electric cooker: 200 °C/ gas: level 3) for about 20 minutes.
Serve sprinkled with fresh oregano leaves.