For the pizza dough, crumble yeast in 220 ml lukewarm water and dissolve in it with 1 teaspoon sugar while stirring. Let stand for about 5 minutes until the yeast water starts to bubble.
Mix 400 g flour and 1 tsp salt in a mixing bowl. Add the yeast water and 2 tablespoons of oil. Knead with the kneading hooks of the mixer for about 5 minutes to a smooth and supple dough. Cover the dough and let it rise in a warm place for about 2 hours.
For the filling, stir tomato paste with 4 tablespoons of water until smooth. Wash the herbs, shake dry and chop the leaves or needles finely. Peel garlic and chop finely. Stir the herbs, garlic, 2 tbsp. oil, some salt and pepper into the tomato paste. Peel onions and cut into thin slices. Cut mozzarella into slices. Cut the peppers into strips. Drain the olives if necessary. Spread the bacon and cut it into thirds.
Knead the dough briefly on a little flour, roll out to a rectangle (approx. 30 x 50 cm) and quarter lengthwise. Spread each strip of dough with spiced tomato paste. Spread onions, peppers, olives, bacon and mozzarella on top.
Carefully roll each strip of dough into loose snails and place on a baking tray lined with baking paper. Cover and leave to rise for another 15 minutes.
Preheat oven (electric cooker: 200 °C/circulating air: 180 °C/gas: see manufacturer). Bake the pizza snails in it on the second rack from below for approx. 25 minutes.