Chile and Peru bicker fiercely over the Pisco Sour’s origin (and that of pisco, too), but by most accounts, the drink’s genesis is tied to a United States citizen. Expat bartender Victor Morris is believed to have concocted the frothy, smooth cocktail at his Lima bar around 1915 or perhaps the early 1920s. Blending pisco, lime juice, egg white and Angostura bitters, the Pisco Sour is earthy, sweet and tart—a cocktail worth fighting over.

Pisco is a grape-distilled spirit that was first made in the 16th century. Piscos vary in style and grape variety, with different expressions ranging in flavor from dry and earthy to floral and fruity. The Pisco Sour doesn’t call for a particular pisco, so enterprising drinkers can experiment to find which they prefer.

Référence : https://www.liquor.com/recipes/pisco-sour/