Eggnog and its Latin American counterparts, such as rompope and coquito, have been making the season bright for centuries. Versions of the recipe date back at least to the mid-1600s. Recipes usually consist of milk, sugar, egg yolks, spices, and rum, bourbon or other high octane alcohol. Everyone knows what an egg is, but today we answer the question everyone (or maybe no one) has been asking: what's nog?