Negroni is an Italian cocktail made of equal parts of gin, Campari, and sweet vermouth. It is so easy that anyone can mix it up. Cheers! . . . Ingredients required Gin - 1-ounce Campari -1-ounce Sweet vermouth - 1 ounce How to make Negroni: 1. In a mixing jar, add gin, Campari and sweet vermouth. 2. Add in ice and stir for 30 seconds. 3. In a serving glass, Add some ice. 4. Pour the prepared negroni cocktail into it. 5. Garnish with an orange peel and serve.