Caper Sauce (Brown).
Put the bones with some fat that was removed from the joint to fry with onion (sliced), a little thyme, parsley, bayleaf, and three or four peppercorns, and a pinch of salt, till well browned, but not burnt: if you have any cooked meat bones put them in the pan, cover with cold water, and then let all come steadily to the boil; keep well skimmed, and boil on slowly for about one and a half hours, then remove the fat, this fat, if boiled with a little water, and any sediment taken away and put to cool, will do for frying purposes. Fry one and a half ounces of butter or fat with one and a half ounces of flour till a good brown colour, and mix in three quarters of a pint of the prepared stock, stir till it boils, then add one and a half tablespoonfuls of common brown vinegar; strain through a strainer, add two tablespoonfuls of capers and use.