A. G. Payne, Cassell's Vegetarian Cookery
“ Mushroom Sauce, White.—Mushroom sauce can be made from fresh mushrooms or tinned mushrooms. When made from fresh they must be small button mushrooms, and not those that are black underneath. They must be peeled, cut small, and have a little lemon juice squeezed over them to prevent them turning colour, or they had still better be thrown into lemon juice and water. They must now be fried in a frying-pan with a small quantity of butter till they are tender, and then added to a little thickened milk, or still better, cream. ”
