Beat Eggs: Crack 4 large eggs and separate the whites from the yolks. In a mixing bowl, beat the egg yolks only until they are smooth.
Add Sugar: Gradually add ½ cup sugar while continuing to whisk.
Beat Egg Whites (optional): Sprinkle 3 pinches of sugar into the egg white and whisk until frothy. Set it aside for later.
Prep milk base: In a saucepan, combine 2 cups whole milk, 1 cup heavy cream, and 2 Cinnamon sticks. Grate about ⅓ Nutmeg and add it to the mix.
Heat Milk: Heat the milk mixture in a saucepan until it's just about to boil.
Combine: Switch off the heating and slowly pour the egg yolk mixture into the hot milk, whisking constantly.
Cook: Switch on the heating again and cook over medium heat, stirring constantly until it thickens slightly.
Add Brandy: Remove from heat and stir in ¾ cup Brandy. Let it cool down for a bit.
Combine: Once it’s cooled down, carefully combine the foamy egg whites with the eggnog mixture.
Serve: Pour into serving glasses and sprinkle with nutmeg if desired.