Step 1.
- In a mixing bowl, whisk together the egg yolks and sugar until pale and slightly thickened.
Step 2.
- Add the milk, cream, and Scotch whisky to the egg yolk mixture, whisking until combined.
Step 3.
- In a separate bowl, beat the egg whites until soft peaks form, then gently fold them into the mixture to add lightness.
Step 4.
- Chill the eggnog in the refrigerator for at least an hour before serving.
Step 5.
- Serve in a punched bowl or large mug, garnished with grated nutmeg.