Bocconcini cheese is bite-sized buffalo mozzarella cheese. This fresh cheese is unmatured and has a light, buttery, and creamy flavor. Traditionally bocconcini is made from buffalo milk, but now commonly made with cow's milk and is packaged in lightly salted water. Because bocconcini and mozzarella are fresh cheeses, they don't have a long shelf life and should be consumed soon after opening.