Add gin, Campari, sweet vermouth and tart cherry juice to mixing glass.
Stir vigorously for 25-30 seconds.
Add ice to a cocktail glass (or not if you want it without ice.) Pour cocktail into glass.
Twist an orange wedge above the glass and drop the wedge into the Negroni.
Notes
You can serve a Negroni on ice or straight up. If you want a little less cherry flavor, use ½ ounce of tart cherry juice. I like my Negroni with an orange slice, some people prefer just a twist of orange peel.