This section is from the book "Studies of American Fungi: Mushrooms, Edible, Poisonous, Etc.", by George Francis Atkinson. Also available from Amazon: Studies of American Fungi: Mushrooms, Edible, Poisonous, Etc..
Wash and dry the mushrooms; put them into a deep saucepan with a tablespoonful of butter to each quart; stand over a quick fire, sort of tossing the saucepan. Do not stir, or you will break the mushrooms. As soon as they have reached the boiling point, push them to the back part of the stove for five minutes; serve on toast. These will be exceedingly dark, are very palatable, and perhaps are the most easily digested of all the varieties.