Sour Grapes

Use 2:1 rich simple syrup for its listed portion.

Chill a cocktail coupe in advance to ensure optimal serving temperature.

Prepare a lemon zest twist to use as a garnish.

Combine the bourbon whiskey, Ferrand Pineau des Charentes, rich sugar syrup, freshly squeezed lemon juice, egg white or its alternatives, and dashes of Angostura Aromatic Bitters in a shaker with ice. Shake well.

Strain the mixture back into the shaker, discarding the ice.

Dry shake the mixture vigorously to create a frothy texture.

Fine strain the cocktail into the pre-chilled coupe glass.

Express the lemon zest twist over the cocktail to release its aromatic oils, then place it as a garnish on the rim of the glass.