Thrillist: Philly's 8 best under-the-radar burgers
Big Fat Greek Burger - In addition to a strict "be nice or go home" policy (seriously!), these guys also have an equally strict making-crazy-burgers policy, as evidenced by their My Boy Bleu; El Guapo; Joocey Lucy; one topped w/ peanut butter & bacon; the Bacon, egg and cheeseburger; the ghost chili-topped Inferno; and the Big Fat Greek Burger (above), which comes w/ feta cheese, gyro meat, and a sauce that's name, tzatziki, is almost as incomprehensible as someone wanting to watch the movie this burger's named after.

Thrillist, https://www.thrillist.com/eat/philadelphia/philly-s-8-best-under-the-radar-burgers