Original Receipt in 'The Cook and Housekeeper's Dictionary' by Mary Eaton (Eaton 1822);ONION GRAVY. Peel and slice some onions into a small stewpan, with an ounce of butter, adding cucumber or celery if approved. Set it on a slow fire, and turn the onion about till it is lightly browned; then stir in half an ounce of flour, a little broth, a little pepper and salt, and boil it up for a few minutes. Add a table-spoonful of port wine, the same of mushroom ketchup, and rub it through a fine sieve. It may be sharpened with a little lemon juice or vinegar. The flavour of this sauce may be varied by adding tarragon, or burnt vinegar.
There are several dishes of this name: (1) (2) (3)