The egg in the word eggnog needs no explanation, but here’s one anyway: Egg is a foundational ingredient in the festive beverage, usually made by combining egg yolks with some other additives (milk, ...

Eggnog can trace its roots back as far as the 14th century, when medieval Englishmen enjoyed a hot cocktail known as posset. Posset didn’t contain eggs—the Oxford English Dictionary describes it as “a ...