So in what used to be a hooker and porn choked section of the city (13th and Arch) lies one of the few remaining old school philadelphia hot dog joints.
They even have the "fish cake sandwich" -pretty much the holy grail of philadelphia cuisine, at least for me - which is a deep fried fish cake on a hot dog bun with chili and/or cheese and mustard.
A Texas Weiner with "the works" comes split and grilled with chili, mustard and chopped raw onions on a short & stout roll. It's really messy and really good. Next time you're in the area stop buy and grab one before they tear it down and put in a starbucks.