Seasonal beverages are drinks that are typically consumed during certain times of the year. Eggnog is a popular seasonal beverage that is traditionally served during the winter months. Eggnog is a creamy, custard-like drink made with milk, cream, sugar, and eggs, and often flavored with spices such as nutmeg or cinnamon. NOG is an abbreviation for eggnog, and is also used to refer to other types of alcoholic beverages.