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Basically a Negroni with bourbon replacing gin. A combo which Negroni lovers should try.
The Boulevardier was made for Erskine Gwynne by Harry McElhone at his Harry's New York Bar in Paris and the drink appears in his 1927 book, Barflies and Cocktails.
Like Harry, Erskine Gwynne was an American expatriate, but he was also a socialite, nephew of railroad tycoon Alfred Vanderbilt and most importantly for this story, edited a monthly magazine called The Boulevardier, hence the drink's name.
The history and other recipes for the Negroni cocktail can be found on our Negroni cocktail page.