Put the following ingredients into a stewpan: Some bits of bacon and lean ham, a carrot, all cut into dice, half an onion, a bunch of herbs, a few mushroom cuttings, two cloves, and four peppercorns. To this add one and a quarter pint of good stock and a glass of Chablis, boil rapidly for ten minutes then simmer till it is reduced to a third. Pass through a sieve and use for masking meat, fowl, fish, &c.
See also: Wikipedia Cookbook.
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.