This section is from the book "Cooking For Profit", by Jessup Whitehead. Also available from Amazon: Cooking for Profit.
Price in first-class restaurants 20 to 25c additional each person.
About half a can with each beefsteak. Drain the mushrooms from their liquor and fry (saute) them in a small frying pan with a little butter. Add pepper and salt. When they have acquired a slight color draw them to one side of the pan, put in a heaping teaspoonful of flour and rub it smooth in the hot butter, still keeping the pan over the fire, and when the flour has become slightly browned pour in the mushroom liquor gradually and a few spoonfuls of water. Shake in the mushrooms, let all boil up, squeeze in the juice of a quarter of a lemon and pour over the beefsteak in the dish.
Cost of mushrooms. Canned mushrooms are all imported. There are artificial caves near Paris where the cultivated mushroom beds are over seven miles long. Several different grades of the canned goods are on the market ranging in price from about $25 to $33 per case of 100 cans (tins they are called by the English). The low priced article is made up largely of mushroom stalks and large open mushrooms. These have to be cut in pieces to serve with steaks. They do well to mince for mushroom sauce. The finer goods are mostly small buttons and are white, beside being more solidly packed. A third of a can of the best goods will generally make a better dish than half a can of the low grade. Retail price from 30c to 40c per can. Cost of mushrooms with beefsteak as above should be 15c, or according to buying rate.
 
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