A Little HistoryThe Epicurean (1894) is Charles Ranhofer's record of thirty-odd years as chef at Delmonico's in New York, and its 3,000-plus numbered entries are cross-referenced exactly as this one is — a working chef's system, where a named dish is often a single distinguishing sauce hung on a standard preparation. The sauce itself is a variation on the old bigarade idea, orange juice and shredded peel in a reduced brown stock, which French cookery is generally said to have attached to duck and goose by the nineteenth century; the currant jelly and tart apple garnish push it toward the sweet-sour treatment that rich waterfowl has attracted across northern Europe generally. The attribution "à la Royer" almost certainly honours a person — a patron, a colleague, a proprietor — but Ranhofer records the name without explanation, and no reliable identification is documented.