Wash and slice the tomatoes. Drain mozzarella and cut into slices. Cut the bread lengthwise, spread the bread halves with garlic butter. Cover the bottom half of the bread with 3/4 of the tomato slices, 3/4 of the mozzarella slices and salami.
Sprinkle with half of the dried oregano. Place the top half of the bread on top and cover with the remaining slices of mozzarella and tomato and sprinkle with rustled dried oregano. Bake bread on a baking tray lined with baking paper in a preheated oven (electric oven: 200°C/ gas: level 3) for about 15 minutes.
In the meantime, wash oregano, dab dry and pluck the leaves from the stalk. Serve bread sprinkled with fresh oregano.