Both Chile and Peru claim this classic as their own.
Add all the ingredients to a shaker and fill with ice.
Shake vigorously and strain into a highball glass or Champagne flute.
Garnish with a lime wheel and 3 gentle drops of Angostura Bitters, which will settle in the foam of the cocktail.
Using a straw, swirl the bitters into a simple design.
Watch Liquor.com advisory board member H. Joseph Ehrmann make a proper Pisco Sour in our How to Cocktail video.