If you've ever set foot inside a pizzeria, you've probably seen a calzone. You know, the alarmingly large turnovers that are stuffed with meat, cheese, and vegetables before being baked until the crust turns golden brown. Perhaps you've even eaten one, maybe while using a knife and a fork to keep all the gooey, melty goodness from spilling all over you.

At the very least, you must've seen the episode of "Seinfeld" where George Costanza gets his boss — George Steinbrenner, owner of the New York Yankees — addicted to them. If you've ever had a good calzone — with a crisp crust and gloriously stretchy cheese — you'll concur with the fictional Steinbrenner's conclusion: They're a helluva thing. But where did calzones come from?