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 lemon juice, simple syrup, ice, egg white, and Angostura bitters. The Chilean version is similar, but uses Chilean pisco and Pica lime, and excludes the bitters and egg white.