In a large mixing bowl, beat the eggs with an electric mixer until they are creamy and lightened in color. Add the sugar and stir with a spoon until all the sugar is dissolved. Add the half-and-half, heavy cream, and vanilla. Stir to combine.
Strain the mixture into an airtight container. Add the liquor and stir to combine. Store in the refrigerator until ready to serve.
When ready to serve, top each glass of eggnog with some grated nutmeg or cinnamon.
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Recipe Tips
Use pasteurized eggs if you are concerned with consuming raw eggs.