Conan Doyle

Select and pre-chill an Old Fashioned glass.

Prepare a garnish of lemon zest twist.

Stir the island single malt Scotch whisky, falernum liqueur, and Fee Brothers Whiskey Barrel Aged bitters with ice.

Strain the mixture into the ice-filled Old Fashioned glass.

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