动摇小屋

A closely-guarded sauce recipe is the hallmark of any classic burger. We made our own, but aren't being so hush-hush about it.

We went behind-the-scenes at Shake Shack, the world's fastest growing, billion-dollar burger chain, and found out that all it takes to make their signature cheeseburger is a little bit of elbow grease. (Plus, you know, actual grease.)