4 cl Buffalo Trace
0,5 cl Fernet Branca
2 Dashes Angostura® aromatic bitters
1 Sugar cube
Muddle the sugar, bitters and a splash of water at the bottom of an Old-Fashioned glass until the sugar is dissolved. Then pour bourbon and Fernet Branca and one large chunk of ice. Stir until chilled, twist a large piece of lemon zest over the cocktail and add to the drink.