A sandwich made of very thinly sliced steak covered in melted cheese(american/whiz/provolone) served on a long hoagie/sub roll--usually with grilled onions. The cheese steak invented in the 1930's in Philadelphia by Pat Oliveri of the world famous Pat's Steaks located in South Philadelphia.
In the original movie, "Rocky" can be seen eating a cheese steak at Pats.
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