Mix flour 1 teaspoon salt and yeast. Add 250 ml lukewarm water and knead to a smooth dough with the dough hooks of the hand mixer. Cover and leave to rise in a warm place for about 1 hour. Form into 4 balls of the same size, cover and leave to rise for another 30 minutes.
Peel and chop the onion and garlic. Heat the oil in a pot. Sauté onion and garlic for about 5 minutes while stirring. Add the tomatoes and chop with a spatula. Bring to the boil and simmer for 30-40 minutes.
Season with oregano and dried basil. Season to taste with sugar, salt and pepper.
Drain the cheese and cut into slices. Wash basil, shake dry, pluck leaves from the stalks. Wash, clean and slice the tomatoes.
Roll out the dough balls on a floured work surface and place 2 dough circles next to each other on a baking tray lined with baking paper (approx. 36 x 41 cm).
Spread each with about 1/4 of the tomato sauce. Cover each with about 1/4 of the tomatoes and about 1/4 of the cheese. Sprinkle with basil, except for something to garnish. Bake in a preheated oven (electric cooker: 250°C/ circulating air: 225 °C/ gas: see
Herst.) Bake for about 13 minutes. Remove from the oven and sprinkle with basil.