Diplomat Sour

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

Select and pre-chill a cocktail coupe.

Prepare a lemon zest twist for garnishing.

Combine the London Dry Gin, Italian red bitter liqueur, freshly squeezed lemon juice, rich sugar syrup, egg white or Fee Foam, and a dash of orange bitters in a cocktail shaker. Add ice and shake vigorously.

Strain the mixture back into the shaker, discarding the ice, and perform a dry shake to emulsify the egg white.

Fine strain the cocktail into the chilled coupe glass.

Express the lemon zest over the drink to release its oils, then use the twist as a garnish.