Pisco Sour is a traditional Peruvian cocktail that is loved for its unique flavors and creamy texture. Made with pisco, lime juice, simple syrup, egg white, and Angostura bitters, this tangy and frothy drink is a popular choice for those looking for a South American twist in Plaza de España Barcelona. The Pisco Sour's combination of citrus, sweetness, and frothy texture makes it a perfect choice for those seeking a unique and flavorful cocktail in the plaza.