A comment on the Midwest Board made me wonder - is it true that saganaki (an appetizer consisting of a slab of Greek cheese that is set on fire by the waiter as he stands by your table, and extinguished with lemon juice as everyone cries "Opaaah!") was invented by a Greek-American restaurateur in Chicago? Has anyone in another city ever seen it in a Greek restaurant? It's been served here in Chicago Greek places for at least 40 years.
As for Gyros, I'm pretty certain it was popularized by Chris Tomaras of Kronos Foods in Chicago, when he invented the rotating spit that allowed the gyros loaf to revolve in front of a heating element and get all nice and crusty. But did the concept of gyros originate in this country?