In a mixing glass, combine rye whiskey, Campari, sweet vermouth and a few ice cubes. Stir gently until combined and chilled.
Strain into a rocks glass. Garnish with a piece of lemon zest.
Notes
Here are some tips and tricks for making the best Boulevardier cocktail:
Experiment with different combinations of bitter liqueurs and whiskeys to find your ultimate Boulevardier.
Always store your open bottles of vermouth in the fridge. (This goes for dry vermouth too.) They’ll last for about 1-2 months after opening them if stored in the fridge.
Don’t shake the cocktail. Prepare it in a mixing glass, using a bar spoon to stir the ingredients with ice cubes.