Crumble the yeast and dissolve in 1/8 litre lukewarm water. Mix flour and 1/2 teaspoon salt. Add the yeast mixture and knead with the dough hooks of the hand mixer. Also knead in 2 tablespoons of oil.
Cut the dough in half, form into balls, cover and leave to rise in a warm place for about 45 minutes. In the meantime wash, clean and slice the tomatoes. Cut mozzarella into slices as well. Grate parmesan.
Wash the basil, pluck the leaves. Knead dough balls on a little flour, roll out round (22 cm Ø). Place a base on a baking tray lined with baking paper. Spread with tomato paste, leaving a rim of about 2 cm wide.
Top with slices of tomato and mozzarella and basil. Season with salt and pepper. Sprinkle with parmesan. Drizzle 1 tablespoon of olive oil over it. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 20 minutes.
Place the base on another baking tray and process in the same way. Serve garnished with basil.