Knead the baking mix and 330 ml of lukewarm water with the dough hooks of the hand mixer to a smooth dough. Cover and leave to rise in a warm place for about 45 minutes.
Grease 2 baking trays and dust with flour. Knead the dough again with floured hands and cut in half. Roll out each half on a little flour to thin oval flat cakes (approx. 26 x 35 cm) and place on the baking trays.
Spread the dough thinly with water and let it rise covered for another 30 minutes.
Wash the thyme, remove the leaves. Peel and wash the potatoes. Slice half into thin slices and lay them on a flat cake like roof tiles. Sprinkle with 5 tablespoons of oil, sprinkle with sea salt, pepper and half of the thyme leaves.
4 Bake the pizza in a preheated oven (electric oven: 250°C/circulating air: 225°C/gas: level 5) for 15-20 minutes until crispy. Bake a second pizza from the remaining ingredients in the same way. Serve immediately.
Drink: strong red wine, for example Chianti.