2 1/2 oz of bourbon whiskey
1/2 oz of green creme de menthe (or Mint liqueur)
1 oz of Lime Juice
1 tsp of sugar
carbonated water (or sparkling water)
5 of mint
Blend all ingredients (except carbonated water) in an electric blender at a low speed for a short length of time. Pour into a collins glass over ice cubes. Fill with carbonated water and serve.