Crumble the yeast and mix it with sugar until the yeast has become liquid (this saves the pre-dough). Put flour, 1/2 teaspoon salt, oil and 300 ml warm water in a bowl. Add mixed yeast and knead everything with the dough hooks of the hand mixer to a smooth dough. Cover the dough and let it rise in a warm place for about 30 minutes. In the meantime peel onion and cut into fine rings.
Wash the tomatoes, grate dry and cut into slices. Cut olives into rings. Grate cheese. Wash oregano and shake dry. Pluck the leaves from the stalks, except some for garnishing, and chop finely. Mix oregano and chunky tomatoes. Season with salt, pepper and 1 pinch of sugar. Roll out the dough on a greased, floured baking tray (32 x 39 cm). Spread tomato sauce evenly on top. Cover with tomatoes, olives, onions and salami.
Season with salt, pepper and 1 pinch of sugar. Roll out the dough on a greased, floured baking tray (32 x 39 cm). Spread tomato sauce evenly on top. Cover with tomatoes, olives, onions and salami. Sprinkle with cheese. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 30 minutes. Remove from the oven, garnish with remaining oregano and serve immediately
15 minutes waiting time