Normande Sauce

Sauce Normande (Normandy fish sauce) teaches one of the canon's most useful lessons: a liaison, a yolk-and-cream thickening, can reduce and concentrate without turning heavy when heat and movement stay in balance. The one true thing to know before touching the pan is this: once the yolks grow warm, the whisk doesn't rest. Controlled evaporation gives you ivory depth; a hard, unattended boil gives you curds.

The source assumed fish velouté and sole fumet, a concentrated fish essence, always ready, a saucier standing over an open fire, and a tammy for the final straining. At home, one wide saucepan supplies the evaporation, a whisk supplies the saucier's attention, and a fine-mesh sieve replaces the tammy. This batch holds every source ratio at about two quarts, enough for a dinner party and the derivative sauces the entry promises. The staff and the tammy were scaffolding. The reduction, marine liquors, liaison, and butter finish are the dish. One cook, one stove, one evening.

Finished properly, Sauce Normande is cream-ivory and deeply savory, brightened by only a few drops of lemon and supple enough to fall from a spoon in a broad ribbon. Guard the reduction by a good third while scraping every corner of the pan. That is the step that decides the sauce.