Joppiesaus

For obvious reasons, a professor of old languages is not expected to stand at a motorway snack counter considering a plastic tub of yellow sauce as if it were a manuscript. This is foolish. The Dutch snackbar (snack bar) is one of our liveliest archives, and it smells of frying oil, raincoats, and boys coming from football with coins in their wet hands.

Joppiesaus carries no medieval name and no VOC shipping receipt, and that is precisely its charm. The name already tells you a smaller, truer story: Joppie was the nickname of Janneke de Jager at Cafetaria Annie in Glanerbrug, in Twente, where a sweet curry-onion sauce began as house sauce before the rest of the country found it. But let me tell you a secret. New tradition is still tradition if people insist on it long enough.

The sauce works because it behaves like the Dutch snack counter itself, cheerful, practical, and just a little sweet. Raw onion gives bite, kerriepoeder (curry powder) gives its yellow warmth, mustard tightens the mayonnaise, and a small sour note keeps it from becoming a sugar pot. You don't cook it. You let it rest. Half an hour is the difference between a bowl of ingredients and a sauce that knows itself.

Hou het altijd simpel, always keep it simple. Make the onion small enough to disappear under the tooth, give the spices time to soften in the acid, then fold everything through mayonnaise and put the bowl in the refrigerator while the fries go crisp. This is not grand cuisine. It is the yellow sauce a weeknight asks for, and weeknights deserve scholarship too.