Pisco is a clear brandy that is popular in both Peru and Chile. The white muscat grapes, from which pisco is distilled, were first grown in Peru by the Spaniards in the 16th century (at that time Peru & Chile were both part of Spain’s American empire. ) When they became independent countries, both claimed the liquor as their own. Therefore the national drink of both Peru and Chile, is the rich “Pisco Sour. ” However there is a difference in sweetness and the citrus used between the two countries’ piscos. Note: Egg whites are sometimes used in chilean pisco sours as well, but for the purist, they will say it is unnecessary adornment.