Several centuries after the Earl of Sandwich changed the world thanks to laziness and a gambling habit, two brothers and humble Philly hot dog vendors, Pat and Harry Olivieri, grew tired of plain old hot dogs. Drawing from their family's roots in Abruzzi, Italy, they randomly assembled a combo of bread, seasonings, and "frizzled" beef, which's a term for chopped, crisped meat sadly not invented by the Magic School Bus's teacher. It was the year of our lord, 1930.
As Pat sat munching his creation, a cabby popped over for a dog and liked what he saw. He scored one for $.10. As all cabbies are wont to do, he offered up unsolicited advice: ditch the hot dogs and make with the steak. So the hot dog stand started selling steak sandwiches, too.