Pisco Sour Cocktail

2 fluid ounces pisco

¾ fluid ounce lime juice

¾ fluid ounce simple syrup

1 egg white

1 cup ice

4 drops Angostura bitters

Combine Pisco, lime juice, simple syrup, and egg white in a cocktail shaker. Cover and shake for 10 to 20 seconds to emulsify the egg white. Add ice; cover and shake until chilled.

Strain into chilled Champagne coupe. Garnish with 4 drops Angostura Bitters swirled with two straws.