Mushroom Sauce ( made with Canned Mushrooms ).
Put a piece of butter the size of a walnut into a small stew-pan or tin basin, and when it bubbles add a tea-spoonful (not heaping) of flour; when well cooked, stir in a cupful of stock (reduced and strong), and half a tea-cupful of the mushroom-juice from the can; let it simmer for a minute or two; then, after straining it, add half or three quarters of a can of mushrooms, pepper, salt, and a few drops of lemon-juice. When thoroughly hot it is ready to pour over the meat.