Inspired by the Peruvian cocktail, this frothy Pisco Sour is made with Pisco brandy, citrus juice, simple syrup, and an egg white garnished with orange bitters.
To a cocktail shaker, add pisco, egg white (if using), lemon juice, and simple syrup (without ice). Shake vigorously until well mixed, about 30 seconds to 1 minute.
To the shaker, add ice about half way, shake again to chill everything, about 30 seconds to a minute.
Strain into a chilled Nick & Nora glass (or Old Fashioned glass), garnish with 3 to 5 drops of Angostura bitters, and serve.
Notes
Pisco brandy: This white brandy is made from fermented muscat grapes. Look for one made in Peru or Chile.
Egg white: Optional but recommended for a frothy top on your drink. Or substitute 1 teaspoon pasteurized egg whites (or omit if you don't want raw eggs).
Lemon juice: The IBA version of the cocktail is made with lemon juice, but the original Pisco Sours were made with lime.
Simple syrup: To make it yourself, combine 1 cup water and 1 cup sugar in a small saucepan over medium heat. Stir until sugar is dissolved (do not boil). Cool before adding to your cocktail shaker.