Essence of Ham for Sauces.
Take four pounds of slices of lean ham, and be careful it is of a good flavour; put it into a stewpan with a little water, six peeled eschallots, and two bay leaves; cover the pan close, set it over a fire, and simmer the ham till three parts done; then add two quarts of water and boil it till tender, strain it through a fine sieve, skim it perfectly free from fat, clear it with whites of eggs, strain it through a tamis, boil it till it is reduced to a pint, and when cold put it into small bottles and cork them close.