When on the West Coast, ordering an Animal Style burger at In-N-Out elicits a certain smug thrill. The mustard-grilled patty, topped with caramelized onions, is not publicized, and so asking for one is akin to uttering a password that grants you entry into a clandestine, boisterous party behind a bookcase. Seeking out off-menu specialties is hardly a new phenomenon; we’ve long been giving waiters knowing glances while requesting insider preparations. Yet, because of their coveted nature, these items are always in flux. From tricked out burgers to nocturnal eggs, here are 13 dishes New York’s hoi polloi don’t know they should be clamoring for.