Extra Shack Sauce from Shake Shack's Secret Menu, Revealed! Slideshow

Shake Shack's Secret Menu, Revealed! Slideshow

Arthur Bovino
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Extra Shack Sauce

You can have extra Shack sauce for fifty cents. But if you forget to ask for a side of sauce when you pay they'll usually still give it to you when you pick up your food. What you do with it, well, that's up to you.