A Little HistoryThe Epicurean (1894) is Charles Ranhofer's record of more than three decades in the kitchens of Delmonico's in New York, and its sauce chapter is essentially the classical French repertoire transplanted to Manhattan, complete with the courtly nomenclature. Sauce La Vallière takes its name, as such sauces generally do, from Louise de La Vallière, an early mistress of Louis XIV, though there is no evidence any dish so called was eaten in her lifetime; nineteenth-century chefs attached names from the Bourbon court to new preparations the way earlier cooks had named them for the ingredient. What identifies it is not the name but the construction: a velouté fortified with veal stock and mushroom liquor, then finished with a yolk-and-cream liaison, the same family that produces sauce allemande and sauce poulette. The channeled mushrooms are the period's signature, a labour of knifework that signalled a house with enough commis to spare for it.