Cut up two ox-tails, separating them at the joints, put a small piece of butter at the bottom of a stewpan, then put in the ox-tails, with a carrot, a turnip, three onions, a head of celery, a leek, and a bunch of parsley, thyme, and bay-leaf; add half a pint of water, and twelve grains of whole pepper, set over a sharp fire, stirring occasionally, until the bottom of the stewpan is covered with a thickish brown glaze, then add a quarter of a pound of flour, stir it in well, and fill up the stewpan with three quarts of water, add a tablespoonful of salt, and stir occasionally until boiling; then set it upon the corner of the stove, skim well, add a gill of good brown gravy, or a few drops of browning, and let simmer until the tails are stewed very tender, the flesh coming easily from the bones, then take them out immediately, and put them into your tureen; pass the soup through a hair sieve over them, add a head of celery, previously cut small and boiled in a little stock, and serve.