Add ice cubes, Campari, gin and vermouth to a cocktail jug, measuring cup, or a big glass.
Stir for 20-30 seconds until liquid is cold and strain into two glasses.
Garnish with half an orange slice each or a twist of orange peel.
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Notes
Add sweetness to your cocktail, tempering the bitterness. Add simple syrup, to taste, or an ounce of fresh orange juice, or top the cocktail with club soda or prosecco.
If desired, make your Negroni with ice but strain it into glasses without ice.
Double the amount of gin for a stronger drink. Or double the Campari or the red vermouth.