1 oz of white rum (or Light Rum)
3/4 oz of Dark rum
1 oz of white creme de cacao (or chocolate liqueur)
1 oz of milk
1 pinch of nutmeg
1/2 oz of white creme de menthe (or Mint liqueur)
Shake and strain all but dark rum into a brandy snifter filled with broken ice. Float the dark rum on top, sprinkle with nutmeg, and serve.