Add Cointreau, whiskey, fresh lemon juice, and bitters to a shaker with ice.
Shake and strain into a chilled cocktail glass.
Hold a bar spoon with the back facing up, just above the cocktail's surface. Slowly pour the Chianti to layer.
Organize your soirée
Put the quantity of ingredients you have, to know how much other ingredients you need and how many cocktails you can make.