1 oz fresh lime juice
1 – 2 tsp superfine sugar
12 mint leaves
2 oz Rum
Sparkling water or club soda
Ice

Stir sugar into the lime juice until dissolved. Lightly muddle the mint in the bottom of a cocktail shaker. Add the rum, lime juice and ice and shake.

Strain into a glass filled with ice. Top with a splash of sparkling water and garnish with a lime and more mint.