In a blender, whirl 3 ice cubes, pisco, sugar, fresh lime juice, and egg whites. Whirl until smooth (you'll no longer hear the ice cracking against the side of the blender) and serve straight up in a martini glass with a dash of aromatic bitters and a wedge of lime.
Peruvian Pantry: Pisco. A brandy distilled from several different grape varieties grown in South America, it is the national drink of Peru and comes in many styles--from smooth and sippable to rough and fiery. (Chile also produces pisco, although Peru contends that the Chilean version is not real pisco but a Chilean brandy that needs its own name.) Pisco became popular in California during the Gold Rush, when Peruvian miners there extolled its virtues to fellow fortune-seekers.
Note: Nutritional analysis is per serving.