When it comes to the battle of Parmigiano-Reggiano vs. Parmesan, some key differences make one of these nutty, pasta-friendly ...

You've also probably heard of Parmigiano Reggiano cheese, and -- not unreasonably, considering the name -- perhaps assumed there was some connection between the two. So what's the deal?

Because Parmigiano Reggiano cheese is not made with vegetarian rennet, strict vegetarians avoid it. However, there are good vegetarian Parmesan-style cheeses available in most supermarkets ...