Pour spirits over ice in an old-fashioned glass (some prefer to use a martini glass) and stir. Garnish with an orange slice.
Traditionally, the Negroni is made with sweet vermouth, but dry vermouth can be used for a different profile. For an herbal twist, substitute Dr. Stoner’s Fresh Herb Vodka for gin. Other variations substitute rum for gin, or add soda water or sparkling wine. Any Italian bitters can be used for the Campari, each providing a unique twist on the classic Negroni.