Pour 0.3 oz of sweet red vermouth, 0.3 oz of dry vermouth, and 0.3 oz of Drambuie into the mixing glass
Add 50 ml of Lowland single-malt whiskey and 2 dashes of Angostura bitters
Fill the glass with ice and mix with a bar spoon
Strain into a chilled cocktail glass
Garnish with orange zest