Why Belgians put mayonnaise on their fries

Why mayonnaise suits Belgian frites

Belgian fries—usually called frites—are often thick-cut, with a crisp outside and a soft, starchy center. Mayonnaise is dense enough to cling to their ridges and rough edges, so each bite carries sauce instead of leaving it pooled at the bottom of the paper cone. Its rich, slightly tangy taste also plays off the fries’ salt and hot potato.

A sauce built into the fry-shop ritual

At a Belgian fritkot, or fry shop, the sauce is part of the order, not an afterthought. Mayonnaise is the familiar choice, though shops commonly offer other sauces too. That makes the pairing less a rule about what every Belgian prefers than a local default: the fries arrive ready to dip, and mayo’s creamy texture makes it an easy match for a generous serving.

The result is a combination designed for the way frites are eaten—hot, by hand, and often straight from the cone.