Place 5 green grapes cut in half and 10 mint leaves into a sling glass
Add 2 bar spoons of granulated sugar and muddle
Fill the sling glass to the top with crushed ice
Pour in 0.5 oz of lime juice and 1.5 oz of white rum
Top up with club soda and stir gently
Top up with crushed ice
Garnish with green grapes and a mint sprig