15ml British Cassis
60ml Dark Rum
30ml Lime Juice
7.5ml Sugar syrup
12 fresh Mint leaves
Lightly muddle the mint leaves, lime juice and sugar at the bottom of a tall glass.
Add crushed ice to half fill the glass.
Pour over the rum and liqueur and stir lightly.
Add more ice to fill the glass and top with soda water.
Garnish with a mint sprig.