Enzoni

Very similar to the classic Negroni, but a little more refreshing. 

1oz London Dry Gin
1oz Campari
.75oz Lemon Juice
.5oz Simple Syrup
4-5 Grapes

Combine the ingredients in a shaker, lightly muddle the grapes. Add ice, shake, double strain into an old fashioned glass with a large ice cube. Garnish with a Grape.