Stir with ice and strain over one large cube into a chilled, Vieux Pontarlier Absintherinsed rocks glass. Garnish with a lemon twist.
In Imbibe! David Wondrich traces the evolution of the plain whiskey cocktail to more evolved versions such as the Fancy Whiskey Cocktail in the 1862 edition and the Improved version above, which appeared 14 years later. —Jerry Thomas, Bar-Tenders Guide, 1876