1 1/2 tsp of green creme de menthe (or Mint liqueur)
1 tbsp of Lime Juice
1/2 tsp of powdered sugar (or sugar)
1 twist of lemon
1 3/4 oz of Light Rum
Shake all ingredients (except lemon peel) with ice and strain into a cocktail glass. Add the twist of lemon peel and serve.