Recipe 474
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Ingredients
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1/2 pint of button mushrooms, 1/2 pint of good beef gravy, No. 435, 1 tablespoonful of mushroom ketchup (if at hand), thickening of butter and flour.

Method
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Put the gravy into a saucepan, thicken it, and stir over the fire until it boils. Prepare the mushrooms by cutting off the stalks and wiping them free from grit and dirt; the large flap mushrooms cut into small pieces will answer for a brown sauce, when the buttons are not obtainable; put them into the gravy, and let them simmer very gently for about 10 minutes; then add the ketchup, and serve.

Source: Mrs Beeton's Book of Household Management (1861)
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