Pour the Campari, gin and sweet vermouth into a small fold-fashioned glass filled with ice (the bigger the pieces of ice, the better).
Stir well and garnish with a slice of fresh orange or a twist of orange peel.
Notes
A negroni should be served in a small tumbler glass or old-fashioned glass over large chunks of ice, also known as “on the rocks”. Negronis are most commonly garnished with a slice of orange (either a thin whole round slice or a thin slice cut in half to look like a half moon) or a twist of orange (a piece of just orange peel) directly in the glass and not on the lip of the glass.