The Boulevardier is similar to a Negroni, sharing two of its three ingredients. It is differentiated by its use of Whiskey as its principal component instead of Gin. Paul Clark, writing for the food blog Serious Eats says, "This isn't a Negroni. It is, however, the Negroni's long-lost autumnal cousin." 

Ingredients

Bourbon Whiskey, Sweet Vermouth, Campari Bitter (28.7 Vol.)

Taste

A nice balance of Whiskey, sweet Vermouth and Campari Bitter. It's a round and full bodied Cocktail. Served with a Orange Zest or dry Orange for a fruity note.

Serve

Stir over ice in a rocks glass, garnish with an orange zest/dry orange.

When?

The Boulevardier is - like most of Vermouth Cocktails - usually to drink before dinner.