Original Pisco Sour

Combine the Pisco, gomme syrup, freshly squeezed lime juice, and egg white in a blender. Blend until smooth.

Transfer the blended mixture to a separate container with ice and shake briskly to chill.

Strain the mixture into a chilled cocktail coupe, ensuring no ice is transferred into the glass.

Garnish with a drop of Angostura bitters on top for a finishing touch.