Sauce Robert.
Melt an ounce of butter, and put to it half an ounce of onion, mixed fine; turn it with a wooden spoon till it takes a light brown colour; stir into it a table-spoonful of mushroom ketchup, and the same quantity of port wine. Add half a pint of broth, a quarter of a tea-spoonful of pepper, and the same of salt; give them a boil; add a tea-spoonful of mustard, the juice of half a lemon, and one or two tea-spoonfuls of vinegar or tarragon.
Another.
Cut a few large onions and some fat bacon into square pieces; put these together into a saucepan over a fire, and shake them well to prevent their burning. When brown, put in some good veal gravy, with a little pepper and salt; let them stew gently till the onions are tender; then add a little salt, vinegar, and mustard, and serve up.