The idea is simple: Put cold milk in a blender, and turn it to foam (and in this case, add cascara, a sweetener derived from coffee beans). The thick, dense foam sticks to the top of the cold drink instead of disappearing into it.

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It’s a neat trick, but don’t you want the foam to mix in? That realization came to me quickly as I sipped the Cold Foam Cascara Cold Brew. The foam retains its shape so well that you don’t get it in every sip, unless you drink from a different part of the cup. If anything, the foam stays atop the coffee too well, which is a shame because the cascara foam is awesome—sweet but not cloying.

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The other issue: At least half a dozen other people got their orders before mine arrived. The Starbucks was fairly busy, but not crazy. Blending the milk took a surprisingly long time—I started to ask if they forgot my order when I saw a barista pouring the foam out of the blender. Starbucks announced the cold-foam drinks—which can also be found on nitro cold brew and blonde iced cappuccino—only a week and a half ago, so I’m sure locations are still getting the hang of it. But I don’t see Starbucks customers having the patience for this every day.

All told, the Cold Foam is a tasty novelty. It’s a clever idea, but probably not the frothy disruptor Starbucks imagines it to be.