Step 1Beat the yolks just to break them up. Add the sugar, a little at a time, beating until the mixture becomes lemon-colored, 5 minutes. Stir in the Bourbon.
Step 2Fold the cream and milk into the yolk mixture, then sprinkle the nutmeg on top.
Step 3Place the eggnog in a punch bowl and set the bowl in a larger bowl of ice to keep cold.