Brown Onion Sauce.
Peel and slice the onions, to which put an equal quantity of cucumber or celery, with an ounce of butter, and set them on a slow fire; turn the onions till they are highly browned; stir in half an ounce of flour; add a little broth, pepper, and salt; boil it up for a few minutes; add a spoonful of claret or port, and some mushroom ketchup. You may sharpen it with a little lemon-juice. Rub through a tamis.