Did the last burger chain you dined at have tuna tataki wontons drizzled with eel sauce? Or anything drizzled with eel sauce, for that matter? Didn't think so. You could do a lot worse than 5 Napkin's Original, a 10oz patty topped with gruyere, caramelized onions, and rosemary aioli or the Avocado Ranch with pepperjack cheese and guac. But you won't have to.