The Pisco Sour is a classic cocktail that originated in Peru but has gained popularity in Cannes. It is made with Pisco, a grape brandy, lime juice, simple syrup, and egg white. The combination of tangy lime and frothy egg white creates a unique and flavorful drink. The Pisco Sour is often garnished with a few drops of Angostura bitters. It is a perfect choice for those who enjoy sour and frothy cocktails.