The Cantina Foresi is located in the Piazza just to the left, as you're facing the Duomo. They offer, what I think is, a fantastic "Di tutto un po"....a little of everything, as well as sandwiches and other charcuterie plates featuring local cheeses and (Wild Boar) meats. You can sample the wines with your luncheon and then purchase some bottles to bring home. There are wine shops heading down the main shopping street, but the Cantina gives you an opportunity to sample local food and wine before you purchase. Orvieto is one of our favorite day trips from Rome...Have a great time!