Cocktail made with:
Splash a generous few drops of Angostura bitters into an Old-Fashioned glass, roll them around until the inside is coated. Pour out the excess, and pour in the Plymouth gin, if you can find it (not the Navy Strength, which is as one would suspect from the name), or London dry gin. Stir. Americans and other utterly wet types may add an ice cube or two, but then you'll never stiffen that upper lip.
Recipe taken from Esquire.