Directions:
Delicious sauce for meats is made in this way: Slice a large onion and fry in butter till it is brown; then cover the onion with rich brown gravy, which is left from roast beef; add mustard, salt and pepper, and if you choose a tablespoonful of Worcestershire sauce; let this boil up, and if too thick, thin it with a little stock or gravy, or even a little hot water with butter. Pour this when done through a fine sieve. Of course a larger quantity can be prepared at once than is mentioned here.