Cloyingly sweet caramelized onions overwhelm the flavor of everything else on the burger.
Also, the roll is inferior to most of the $2.00 banh mi joints on Valley Blvd, or even a Jack in the Box ciabatta. Can't have a great sandwich without great bread. Like double-baked rye for Langer's, Amoroso for cheesesteak, or toasted sesame roll for Top Dog.
Props for the beer selection, though.