Butler's Tipple

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

Select and pre-chill a cocktail coupe.

Prepare a lemon zest twist for garnishing.

Stir the cognac, Yellow Chartreuse, gentian liqueur, rich sugar syrup, and chilled water with ice.

Fine strain the mixture into the chilled coupe.

Express the lemon zest twist over the cocktail and use it as a garnish.