Thursday: The Humm Burger by Daniel Humm
Shake Shack actually operated out of Eleven Madison Park's kitchen for a little while, so this one shows off a lot of their fine-dining roots: Gruyere is melted on top of this "Earthy" burger, which's also piled with black truffle mayo, celery relish, applewood-smoked bacon (so Earthy!), and -- because they're ballin' out on their b-day -- fresh-shaved black truffles.
Bonus things going down on their actual anniversary (June 12th): A 6ft x 6ft cake made by Cronut master Dominique Ansel, which will be given out for free to people in line. There'll also be bands all day long, and the resurgence of their original hot dog cart, which'll be operating on a pay-what-you-want basis. If you're picking just one day to go, this is it.