Peel the potatoes and slice them into thin slices (the thinner the better). Lay out on a baking sheet. Spread the ham and salami on top as you like. Now put the tomato sauce on top and sprinkle generously with parmesan. And now you can start using the leftovers: distribute the ingredients mentioned above (or whatever else you like on the pizza) on the base, season at the end and sprinkle with grated cheese. In the oven at 200 ° for approx. 45 minutes.