Anytime we have a potato pizza it takes us back to our first trip to Italy. It was there, on the streets of Rome, that we were first introduced to pizza and potato married together. It has been a favorite ever since. A word of warning, though: The potato slices baked with rosemary are highly addictive, so you might want to make extra for snacking on. Somehow half of the tray seems to disappear before the pizzas are ever assembled.