Fill an old fashioned glass with large ice cubes.
Add the gin, Campari, and sweet red vermouth directly into the glass.
Stir gently for 20–30 seconds to combine and chill.
Garnish with an orange slice or orange peel twist, expressing the oils over the surface of the drink before placing.
The Negroni was allegedly born in 1919 when Count Camillo Negroni asked bartender Fosco Scarselli at Caffè Casoni in Florence to strengthen his Americano by swapping soda water for gin - a happy accident that became one of the world's most beloved cocktails.
My Bar Shelf reads your shelf and shows you every cocktail you can make from what you already own, including Negroni.