Mosterdsaus (Dutch Mustard Sauce)

In my grandmother's second notebook, mosterdsaus appears without ceremony, which is how you know it mattered. The grand dishes get titles and underlines. The dependable ones simply stand there in pencil: butter, flour, stock, mustard, cream. A sauce for boiled eggs when money was tight, for fish when the boats were kind, for ham when company came. History and cookery, they cannot be separated, but sometimes history arrives in a small saucepan.

The name already tells you the old journey. Mosterd comes through French from the world of mustum, grape must, because mustard seed was once mixed with young wine and made into that lovely, sharp paste the Romans carried north. The Dutch did what we so often do: kept the sharpness, made it useful, and put it beside potatoes. For obvious reasons, this is civilization.

But let me tell you a secret. The sauce is not about making mustard gentle. It is about giving mustard a warm coat so it can sit at the table with delicate things. The roux gives body, the stock gives savour, the cream rounds the edge, and the mustard goes in late so its bite survives. Hou het altijd simpel, always keep it simple: cook the flour properly, add the liquid patiently, and never boil the mustard as if it owes you money.