Place 5 fresh green grapes in the base of a cocktail shaker and muddle firmly to release all juice and pulp.
Add the gin, Campari, lemon juice, and rich sugar syrup.
Fill the shaker with ice and shake vigorously for 10–12 seconds.
Fine-strain through a Hawthorne strainer and a fine mesh strainer into an ice-filled old-fashioned glass.
Garnish with a skewered orange slice wheel and/or a green grape sail.
The Enzoni was created by Vincenzo Errico at Milk & Honey in London around 2003. Muddling grapes rather than using a store-bought juice is non-negotiable - the freshly broken skins add a subtle tannic grip that holds the cocktail together.
My Bar Shelf reads your shelf and shows you every cocktail you can make from what you already own, including Enzoni.