1 1/2 oz of Dark rum
1/2 oz of dark creme de cacao (or chocolate liqueur)
4 oz of hot chocolate
1/2 oz of bourbon whiskey
2 oz of whipped heavy cream (or Pistachio Ice Cream)
Pour the rum, bourbon, creme de cacao and hot chocolate into an Irish coffee cup or glass. Spoon the cream carefully on top, and serve.