The key feature of the ShackMeister is crispy-fried ShackMeister Ale-marinated shallots, which are joined by ShackSauce, cheese, and an Angus beef patty on a potato bun.
It goes for $6.89 here in Southern California (compared to $5.89 for a regular ShackBurger or Cheeseburger) but prices vary with location.
The ShackMeister first made its debut back in late 2014.
Photo via Shake Shack.