From El Jorocho- mentioned below in "best of 2008". Carnitas (braised pork) with lettuce, tomato, cheese, jalepenos, avacado, an unknown cilantro-esque herb and mayonnaise on a sesame seed bun. Not unlike a taco/roast pork/cheesesteak hybrid and should be the new official sandwich of philadelphia. Delicious.
Also Los Taquitos De Puebla is rumoured to have amazing Cemitas, including the "Cabeza de res" made with "beef head meat". Nice.
El Jorocho - 13th & Ellsworth Taquitos De Puebla - 1114 S 9th St.