Cheesesteak
Any American would likely mention cheesesteaks if you asked them to name an iconic Philadelphia dish. Cheesesteaks are properly legendary, delectable, amusing, and an experience and they're not incorrect for saying so. The rivalry between Pat's King of Steaks and Geno's Steaks may be evident if you visit either restaurant, and the locals both assert that their cheesesteaks are quite distinct from one another, yet the slang is the same. The Philadelphia Inquirer claims that "wiz wit" refers to a cheesesteak with cheese wiz and onions. Say wiz without if you don't want the onions on there.
Even if you're not a fan of onions, it would be a mistake to order them without them because the caramelized onions give the sandwich a lot of flavors. You may get cheesesteaks anywhere in Philadelphia and the surrounding region, but if you want authentic taste, visit Pat's King of Steaks or Geno's Steaks in the Italian Market neighborhood of Philadelphia. Fortunately, they are conveniently situated across the street from one another if you wish to compare both (talk about a classic rivalry).