Espagnole sauce

The chief ingredient of this useful sauce is good stock, to which add any remnants and bones of fowl or game. Butter the bottom of a stewpan with at least two ounces of butter, and in it put slices of lean veal, ham, bacon, cuttings of beef, fowl, or game trimmings, three peppercorns, mushroom trimmings, a tomato, a carrot and a turnip cut up, an onion stuck with two cloves, a bay leaf, a sprig of thyme, parsley and marjoram. Put the lid on the stewpan and braize well for fifteen minutes, then stir in a tablespoonful of flour, and pour in a quarter pint of good boiling stock and boil very gently for fifteen minutes, then strain through a tamis, skim off all the grease, pour the sauce into an earthenware vessel, and let it get cold. If it is not rich enough, add a little Liebig or glaze. Pass through a sieve again before using.

See also: Wikipedia Cookbook.

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Source: The Cook's Decameron: A Study In Taste, Containing Over Two Hundred Recipes For Italian Dishes from a project that puts out-of-copyright texts into the public domain. This is from a *very* old source, and reflects the cooking at the turn of the last century. Update as necessary.