One day in the early 1930’s Pat Olivieri, an Italian American ran out of frankfurters on his hot dog stand in the South Philadelphia Italian Market.
Instead of closing shop for the day he decided to substitute the German sausage with thinly cut beef and cheese on an Italian bread roll. A passing cab driver bought the sandwich and insisted Pat forget the hot dogs and concentrate on the steak and cheese sandwich and so the Philly Cheesesteak was born.
They became so popular that Pat opened his own restaurant which still operates today. The Philly Cheesesteak has since become an icon in American fast food culture