What makes Parmigiano-Reggiano Parmigiano-Reggiano?

Great wheels of parmesan cheese, stamped all about with codes and official-looking markings, loudly shout that they are the real thing: Parmigiano-Reggiano DOP. They’re backed by a long list of rules and regulations that the producers must obey in order to qualify for the seal of approval, rules that were drawn up by the producers themselves to protect their product from cheaper interlopers. For parmesan, the rules specify how the milk is turned into cheese and how the cheese is matured. They sp...