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You won't find bell peppers or mushrooms on a traditional Philadelphia cheese steak, which has just steak and cheese, and is served either "wit" or "witout" onions (additional vegetable matter can be added to the sandwich, but that makes it a "mushroom steak" or a "pepper steak", etc.)
If you're in the Pasadena area, go to Luigi Ortega's on Colorado, across from PCC. They serve an authentic Philly cheesesteak on a proper Amoroso roll. Cheez Wiz is available, too, although I think they regularly use either American or Provolone (I almost always go for the Wiz).
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This thread should give you plenty to chew on: http://chowhound.chow.com/topics/879153


