A pisco sour is an alcoholic cocktail of Peruvian origin that is typical of the cuisines from Chile and Peru, considered also a South American classic. The drink's name comes from pisco, which is its base liquor, and the cocktail term sour, in reference to sour citrus juice and sweetener components. The Peruvian pisco sour uses Peruvian pisco as the base liquor and adds freshly squeezed lime juice, syrup, ice, egg white, and Angostura bitters.