There is a tradition in Pittsburgh known as the Primanti Sandwich. It's essentially some sort of meat (Italian cold cuts or beef) topped with fried potatoes—basically a huge sandwich with smushed french fries. (see photo of PNC's version above).Here's how the Primantis themselves describe its origins in the 1930's:
"I fried the potatoes on our grill and they looked pretty good. A few of our customers asked for them, so I put the potatoes on their sandwiches."
If you come to Pittsburgh to follow the Sox this weekend, you need to try it—but according to our FN taste-tester, you might be better off in the Primanti restaurant itself and not PNC. Kind of like Fenway food vs. the vendors outside. You get the drift.