Bouchot

Select and pre-chill an Old Fashioned glass.

Prepare a lemon zest twist for garnish.

Stir the Calvados, gentian liqueur, and chilled Americano bianco with ice.

Strain the mixture into the glass filled with ice, preferably over a large cube or block of ice.

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