The drink is also easy to screw up. The worst is when you see folks muddling cherries and orange slices into the glass, turning the drink into a gross, pulpy, fruity mess that's nothing close to the original. The best thing to remember with this cocktail—and pretty much every other cocktail, come to think of it—is to keep it simple. All you need are ice, bitters, sugar, an orange peel and whiskey. (And just so you know, any of the bottles featured in our whiskey guide will make a mighty fine Old Fashioned.) Enjoy.