One thing we did eat in Italy that we don't in the states is carpaccio (raw beef). The meat here is not the same and I don't know my butcher well enough for that here.
I was stationed in Naples, Italy for 2 years. I really loved their carpaccio (raw beef) and mozzarella di bufala (buffalo cheese). The buffalo cheese is mixed down with cow's milk, but they leave enough buffalo milk in the cheese to give it a good kick. Our mozzarella here in the states does not compare. There was a lot of great food in Italy that we cannot get here in the USA.