Scrapple is more from Central PA than from Pittsburgh.
Aren't wings famous for being from Buffalo not Pittsburgh?
A few things that Pittsburgh is famous for...
Primanti's sandwiches
Heinz Ketchup
Klondike bars
Devonshire sandwich - basically an open face turkey sandwich with a cheesy cream sauce
Iron City beer
Isaly's chipped chopped ham
Clark bar
Fried zucchini strips
Pierogies
Big Mac - invented in Pittsburgh
I just found this on wikipedia...
Roethlis-burger Hamburger named after Steelers
quarterback Ben Roethlisberger; made up of ground beef, sausage, scrambled eggs, grilled onions and American cheese