1/2 tsp of green creme de menthe (or Mint liqueur)
1/2 tsp of Triple Sec
1 tbsp of Lime Juice
1 tsp of powdered sugar (or sugar)
1 1/2 oz of Light Rum
1 slice of lime
Shake all ingredients (except lime slice) with ice and strain into a cocktail glass. Add the slice of lime and serve.