Shake Shack just introduced their newest limited edition burger: The Roadside Shack. Inspired by many traditional roadside burgers, this beef cheeseburger is topped by caramelized onions that have been simmered in bacon and beer.
I asked for a double patty which costs $8.99 ($6.19 for a single)
Shake Shack is also known for their frozen custard shakes and concretes.
Right now, the special concrete at all Massachusetts locations is the coffee and doughnuts, which has cake doughnut from Union Square Donuts in Somerville (like, my favorite) and coffee marshmallow sauce.