QUIZ: What Melted Cheese Is This?

That's right. It's provolone. Though we typically see the sweeter and more mild variety of provolone in the United States, there is sharp provolone which is very sharp indeed. The provolone that you'll find on your Philly cheesesteak sandwich (or on this Italian sausage panini) is a mild-flavored, full-fat cow's milk cheese.