If you want the real deal, it can be hard to pick out a cheese from all the options at the store. Here's how to make sure your parmesan cheese is authentic.

Its Italian name, in fact, Parmigiano Reggiano, means 'from the cities of Parma and Reggio Emilia.' We visited a dairy in Parma, Italy to find out how the cheese is made and why it is so expensive.

For decades, Parmigiano Reggiano has been a cornerstone of Italian cuisine – a cheese so steeped in tradition that its production is still governed by the same methods used a millennium ago.