4.0 parts White Rum or Cachaca (cut down the sugar if using cachaca)
3.0 parts lime juice
3 sprigs of Mint
2 teaspoons Sugar
Soda Water (or just water)

In an old fashioned glass, muddle most of the mint with sugar and slices of lime plus a dash of lime juice. Add in ice, Mix in rum and soda water. Garnish with sprig of mint.