Beat yolks until fluffy and completely mixed. Add the sugar and beat the mixture until thick. Stir in the milk and liquor. Chill for at least 3 hours, preferably overnight.
Whip the cream until good and thick. Fold in whipped cream; it will appear it has totally thinned out. Chill for one hour.
Sprinkle the top with cinnamon and nutmeg to taste. (Optional)
Serve. Keep well chilled because of the eggs. Stir occasionally.
Notes
*Full alcohol amounts make for a VERY strong drink. Start with 10 oz each of the whiskey and rum, then increase to taste.