French · Cocktail
Take a Negroni and swap the gin for bourbon. That's a Boulevardier, and it's what you drink from October onwards when gin starts feeling too cold.

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The one thing that matters
Stir it, never shake. All three ingredients are spirits and shaking turns it cloudy and thin. Thirty seconds over plenty of ice.
Equal parts is the classic build: one ounce each of bourbon, Campari and sweet vermouth. Most bartenders now push the bourbon up to an ounce and a half, because whiskey is heavier than gin and one-to-one-to-one lets the Campari run away with it. Try both and settle the argument yourself.
The bourbon changes it more than you'd expect. Where a Negroni is sharp and botanical, this is round, warm and slightly sweet underneath the bitterness. Maker's Mark is wheated, which pushes it further that way.
It was invented in Paris in the 1920s by an American writer who ran a magazine called The Boulevardier, which is a word for a man who spends a great deal of time walking around town with nothing much to do.
Same warning as the Negroni: vermouth is wine and it goes off. Keep it in the fridge once open, and toss it after a month. Stale vermouth is the reason most homemade versions of this taste dusty.
Serve over one big cube with an orange peel squeezed over the top. It's an aperitivo by design, so put it before dinner with something salty, or after dinner instead of dessert.