A Little HistoryCharles Ranhofer, chef at Delmonico's, gives the dish a French title, sauce aux caneberges, but the fruit is thoroughly American: Vaccinium macrocarpon, the large-fruited cranberry of northeastern bogs, harvested commercially on Cape Cod from the early nineteenth century and shipped in barrels to city markets. Its place in The Epicurean among the cold sauces, rather than as a holiday side dish, reflects period practice, in which sharp fruit jellies stood in the same rank as Cumberland sauce and other cold accompaniments to roast and game. The instruction to use an untinned pan points to the confectioner's tradition Ranhofer trained in, where unlined copper was believed to preserve the color of red fruit preserves.