Brooklyn chocolate company Mast Brothers has teamed up with Shake Shack to sell a special dark chocolate bar which will be sold at all Shake Shack locations for $9.
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There's milkshakes and then there's concretes. And if you want to truly experience a concrete—the insanely thick frozen custard concoction that's so dense you can hold it upside down with the spoon still suspended—you need to visit the St. Louis institution Ted Drewes' Frozen Custard.