169. ESSENCE OF MUSHROOMS.
Chop any quantity of mushrooms, place these in a stewpan with a little lemon-juice and a small piece of butter, simmer them on the fire for two or three minutes, and then moisten with a ladleful of white broth; set the essence to boil gently on the stove for ten minutes, and then pass it with pressure through a sieve into a basin for use.
This essence is useful for flavouring sauces.