Eggnog: How a Medieval Posset Became a Christmas Classic

Eggnog is one of those drinks that seems to have been invented purely for Christmas, so completely has it fused with the season. Yet its origins lie centuries earlier and an ocean away, in the warm, curdled drinks of medieval England. The story of how a humble posset became a festive American icon is a tale of migration, abundance and a knack for reinvention.

The medieval posset

Long before anyone spoke of eggnog, the English drank posset: hot milk curdled with ale or wine and seasoned with spices. It was a warming, nourishing concoction, valued both as a comfort and, like so many old drinks, as a remedy for whatever ailed you. The wealthy enriched their possets with eggs, cream and costly spices such as nutmeg and cinnamon, turning a simple curdled drink into something fit for a celebration.

Because dairy, eggs and imported spices were luxuries, a generous posset was a quiet show of prosperity. To serve one laced with sherry or fortified wine, thickened with eggs and dusted with nutmeg, was to demonstrate that you could afford the good things — exactly the role eggnog would later play at the festive table.

Crossing the Atlantic

When English settlers carried their posset habit to the American colonies, the drink found unusually fertile ground. Farms there had milk and eggs in abundance, far more cheaply than in Britain, and a once-luxurious drink became something ordinary households could make freely. The one change was the spirit. Expensive European wines and brandies gave way to the cheap, plentiful rum arriving from the Caribbean trade, and later to American whiskey and bourbon.

That switch shaped the drink we know. Rum and bourbon gave colonial eggnog a warmth and bite that suited the new world’s tastes and its purses alike. The drink became thoroughly American, even as it kept the creamy, spiced, egg-rich character inherited from the English posset.

Becoming a Christmas institution

In America, eggnog settled firmly into the winter calendar. Its richness suited celebration, its ingredients were on hand in the cold months, and the warm spices tied it neatly to the festive mood. It became the drink ladled from a punchbowl at Christmas gatherings, a fixture so familiar that to many it simply is the taste of the holidays.

The same broad idea — eggs, dairy, sugar, spirit — flowered into a whole family of related drinks. The Dutch perfected the thick, spoonable advocaat; the Italians warmed their version into the cosy bombardino; and the hot, frothy Tom and Jerry became a North American winter speciality in its own right. Each is a variation on the same egg-enriched theme, adapted to local tastes and traditions.

Why it never travelled back

Curiously, for all its success in America, eggnog never truly recaptured the wider world. In Britain, where its ancestor was born, it remains a relative novelty rather than a staple. Elsewhere in Europe the egg-and-cream impulse went its own way, into advocaat and bombardino, rather than circling back to the American style. Eggnog became, in effect, an American dialect of an old European idea — beloved at home, regarded as a curiosity abroad.

That is part of what makes its history so engaging. A drink that began in medieval English kitchens crossed the sea, swapped its wine for rum, and put down such deep roots in its adopted home that it now feels distinctly, almost exclusively, American. The posset may be all but forgotten, but in every nutmeg-dusted glass of eggnog its spirit quietly lives on.