Clean, wash and halve the mushrooms. Peel and halve the onion and cut into strips. Wash the oregano and remove the leaves. Heat oil in a large pan. Fry the mushrooms and onion.
Season with salt and pepper. Add oregano and fry briefly more. Take it out and let it drain.
Wash and slice the tomatoes. Open the dough tin, take out the dough and place 2 pieces of dough on top of each other. Roll out oval on some flour (approx. 15 cm long) and place on a baking tray lined with baking paper.
Season sour cream with salt and pepper. Spread on the pastry, cover with mushrooms, onion, tomatoes and salami. Dice the mozzarella and sprinkle over it. In a hot oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see
manufacturer) bake for about 15 minutes until golden brown