Add about a shot of rum, or 1.5 ounces, to each glass of eggnog; this amounts to about 15 ounces of rum per quart of eggnog. The amount of spirits ultimately added to the eggnog is dependent on the individual preferences of the person drinking it.
Eggnog is a traditional holiday beverage and is made of eggs, sugar, milk and cream. There are spices added such as whole cloves, cinnamon, nutmeg and vanilla. While eggnog can be enjoyed as a "kid-friendly" beverage without alcohol, many adults feel that spiking it with rum, brandy or another spirit enhances the flavor. For a traditional colonial flavor, adding a shot or two of microbrew ale to create a frothy and creamy drink.
Although eggnog might bring thoughts of merry old England to mind, it is actually a traditional American drink. It dates back to the Colonial period, and while nobody knows of its specific origin, thoughts are that it might have been a concoction of dairy farmers to enhance their products. A traditional English and American drink was the flip, where an egg was flipped with a spirit such as rum, whiskey or port. This also may have been an inspiration for today's traditional eggnog. The "nog" part of the phrase could have come from "noggin," which was a term for an old English mug or a combination of the words "egg" and "grog."