WHITE GRAVY (Coulis)

Butter the bottom of a sauce-pan, and put in two pounds of scraps of veal, and, if you have it at hand, some cold fowl, or cold turkey; add two white onions, and four or five blades of mace; pour over it a pint of boiling water, or broth; cover the pan, and set it over a slow fire for five or six hours, pricking and pressing the meat with a fork and spoon. Strain it through a sieve, and if it is too thin, set it again over the fire, to stew a while longer.