Put the flour in a bowl and press a depression in the middle. Dissolve yeast and 1 teaspoon sugar in 250 ml lukewarm water, pour into the hollow. Mix with some flour from the edge to a pre-dough. Cover and leave to rise in a warm place for about 15 minutes. Add 1 tsp salt and 3 tbsp oil to the pre-dough and knead for 5-10 minutes to a smooth dough. If the dough is too firm, add about 2 tbsp. water. Cover the dough and let it rise in a warm place for about 30 minutes.
Peel and finely dice the onion and garlic. Heat 2 tbsp. olive oil in a pot, fry onion and garlic in it. Add tomatoes, season with salt, pepper and 1 tsp. sugar. Let simmer at mild heat for about 20 minutes, season again. Coarsely grate mozzarella and parmesan
Knead the dough once again, cut in half and form into balls. Roll out balls on a floured work surface (approx. 26 cm Ø) and place 1 base on each of two baking trays lined with baking paper. Spread half of the tomato sauce on each, sprinkle with thyme and cheese. Bake the trays one after the other in a preheated oven (electric cooker: 250°C/ convection oven: 225 °C/ gas: see manufacturer) for 13-15 minutes
Meanwhile wash dandelion and flowers and dab dry. Coarsely chop leaves, pluck petals. Take out finished pizzas and cover with half ham and half dandelion, sprinkle with the petals. Serve immediately
Waiting time approx. 15 minutes