Step 1.
- In a large mixing bowl, whisk together the egg yolks and sugar until the mixture is pale and frothy.
Step 2.
- Add the milk, cream, and spiced rum to the egg yolk mixture, stirring well to combine.
Step 3.
- In a separate bowl, beat the egg whites until soft peaks form, then fold them gently into the eggnog mixture.
Step 4.
- Chill the eggnog in the refrigerator for at least an hour before serving.
Step 5.
- Serve in punch cups and garnish with a sprinkle of ground nutmeg.