French fries Period BOrigin theory BVerified

French fries are potatoes cut into batons and fried in hot oil—a street food that grew up in France and Belgium. They are eaten everywhere today, but the form we recognize took shape only between the end of the eighteenth century and the middle of the nineteenth. Pierre Leclercq, a food historian at the University of Liège, reconstructed that timeline by combing archives and libraries, and it is his account that now stands as the settled one.

The potato came to Europe from the New World, and for a long time after it arrived Europeans grew it as an ornamental plant or as fodder rather than food. In the Low Countries it settled onto the table over the course of the eighteenth century; in the villages of the Meuse valley it turned up only around the 1730s. Until the potato crossed the sea and became something people ate day to day, there was no street food to be made by slicing it and dropping it into oil.

The dish appeared in the street. In Paris, vendors set up at the foot of the Pont Neuf, the bridge across the Seine, cut potatoes, fried them on the spot, and sold them there. The food is first mentioned in Paris in 1775, and the oldest surviving recipe comes from the 1794/95 cookbook La cuisinière républicaine—though what that book describes is thin slices fried, not the thick baton familiar today. Deep-frying in a bath of oil spread around 1800, and the iconic baton shape settled in Paris around 1840, roughly a decade ahead of what the cookbooks recorded. It reached Belgium in 1844, brought by Frédéric Krieger, a Bavarian who billed it as à l'instar de Paris, "in the Paris manner." Belgium was the country that took it in and raised it into a national dish. This fried potato put down roots not at grand tables but as street food—something people bought at bridge-side and market stalls and ate standing up as they passed.

The Belgian claim is the one most people have heard. The journalist Jo Gérard popularized it in 1984: the people of the Meuse valley around Namur, unable to fish once the river froze in winter, are said to have cut potatoes into the shape of small fish and fried them instead—and to have done so before 1680.

The whole story hangs on a single 1781 family document. When Pierre Leclercq, the food historian at the University of Liège, read it closely, it described a different scene: potato slices lightly browned in a very small amount of oil, not batons submerged in a bath of hot oil. The line was never an account of inventing the French fry.

And the dates fail even earlier. The potato only took hold as a crop in the Meuse valley around the 1730s; before 1680 there was no frying potato to be had in that country at all. It is also hard to picture a poor farming village of the period sparing the quantity of fat that deep-frying demands.

What the sources point to instead is the French account. The line runs from the fried potatoes sold at the stalls of the Pont Neuf in Paris, through the first mention in 1775 and the recipe of 1794/95, to the baton shape that settled in Paris around 1840. The neat irony is that Leclercq, the man who confirmed the French origin, is himself Belgian. So the name does not lie the way the popular counter-story insists: when the potato became food, and when it was first fried into batons, tell the beginning of this dish far more accurately than the proud national legend does.