According to Ted Haigh in Vintage Spirits and Forgotten Cocktails, the Boulevardier was a Prohibition-era cocktail invented at Harry’s Bar in Paris, circa 1927. The drink is in essence a Negroni, substituting Bourbon for Gin, but with much more of a punch. I actually prefer Rye, which makes a smoother libation.
In any event, I have found the Boulevardier a nice replacement to the Manhattan. The drink is spicier with a more bitter bite, both things I tend to enjoy when the weather suggests Winter…
Ladies and Gentlemen, The Boulevardier:
2oz. Bourbon (I prefer Rye)
1oz. Sweet Vermouth (I prefer Carpano Antico)
Shake the ingredients with crushed ice, vigorously. Strain into a cocktail glass. Garnish with a cherry.