If you were to whip up a batch of eggnog on a steamy July afternoon, that would be, to paraphrase Ron Burgundy, a bad choice. It would also get your roommates questioning your judgment. But during the holidays? Bring on the raw-egg adult beverages! With possible origins in a British drink called posset, eggnog began as a beloved winter beverage among aristocrats. It’s evolved into a festive holiday treat for everyone. If you haven’t tried this frothy, sweet, combination of milk, cream, sugar, whipped egg whites and yolks, cut through with a splash of spirits, you haven’t fully experienced the holiday season.