This version of the official cocktail of Peru, by Charissa Luke of Zest Bakery, is the perfect frothy blend of sweet and sour. The blended drink contains pisco, a clear grape brandy, and gets its foam cap from a few egg whites. A dash or three of bitters adds a bit of aromatics to the cocktail.
Because this cocktail uses raw egg whites, make sure you have the freshest eggs possible. If you are elderly, pregnant (you probably aren't going to drink a cocktail whilst preggers, right?) or immuno-compromised in any way, consider eliminating them, or using pasteurized egg whites (in a carton).