Philly cheesesteak sliders are smaller versions of the real thing, and are ideal for people wanting to share or wanting a smaller portion. And sliders contain the same ingredients as the real Philly cheesesteak, including the chopped ribeye beef, cheese and onions. Sliders are older than you might think; the idea of the small sandwich or burger was invented by a hamburger chain during the 1920s. The name apparently came from sailors in the US Navy, and was used to describe a burger that slid into the bun easily as it was too greasy. And the classic cheesesteak sandwich dates from the 1930s; supposedly a Philadelphia hot dog seller put some beef in a roll instead of the sausage. It supposedly smelled so good that a passing taxi driver just couldn’t resist it and today it’s as much an icon of Philadelphia as the Liberty Bell.