131. Brown Sauce.—Put two ounces of butter into a stewpan, rub it over the bottom, peel two or three large onions, cut them in thick slices, lay them on the bottom, cut into small pieces about two pounds of knuckle of veal,[3] all meat, or three pounds if with bone, a quarter of a pound of lean bacon cut small, two cloves, a few peppercorns, a tablespoonful of salt, two bay-leaves, a gill of water; set it on a brisk fire, let it remain ten minutes, when stir it well round, subdue the fire, let it remain a few minutes longer, and stir now and then until it has a nice brown color; fill your pan with three quarts of water; when boiling, set it on the corner of the stove, with the lid three parts on the saucepan; when boiling, skim fat and all; after one hour, or one hour and a half simmering, pass it through a sieve into a basin. To make the thickening or roux for it, proceed as follows:—Put two ounces of butter into a pan, which melt on a slow fire, then add three ounces of flour, stir it until getting a thin deep yellow color; this in France is called roux, being very useful in cookery, and will be often referred to in these receipts. This process will take five minutes, when remove from the fire for two minutes to cool, then add at once three and a quarter pints of the above stock, very quickly set it on the fire to boil, remove to corner to simmer, and skim; it ought to be entirely free from grease, and of a light chestnut color.