Shake Shack's new, limited-run burger is an homage to the traditional roadside burger stands of the past.

The Roadside Shack, available at all locations starting Monday, July 27 for a limited time, features caramelized onions simmered in beer and bacon, atop the Shack's signature 100% all-natural Angus beef cheeseburger.  

"The beer and bacon caramelized onions bring out even more depth of flavor and juiciness to our delicious flat-top griddled burgers." said Mark Rosati, culinary director of Shake Shack, in a statement released today. 

The Roadside Shack is $6.19 for a single, and $8.99 for a double burger.