1/2  of a lime sliced
2 teaspoons white sugar
2/3 cup ice
fresh mint leaves
2 oz white rum
splash of club soda 



In each glass, stir together lime and sugar with the back of a spoon an muddle until the sugar dissolves.  

Tear mint leaves and add to glass.   Stir or muddle for a few seconds more to release the oils.  

Add ice, rum, and a splash of club soda. Stir and garnish with a fresh mint sprig and a lime wedge.