Robert Sauce for roast Pork, or Geese, &c.—(No. 342.)
Put an ounce of butter into a pint stew-pan: when it is melted, add to it half an ounce of onion minced very fine; turn it with a wooden spoon till it takes a light brown colour; then stir in a table-spoonful of flour, a table-spoonful of mushroom catchup (with or without the like quantity of port wine), half a pint of broth or water, and a quarter of a tea-spoonful of pepper, the same of salt; give them a boil; then add a tea-spoonful of mustard, and the juice of half a lemon, or one or two tea-spoonfuls of vinegar or basil (No. 397), or tarragon (No. 396), or burnet vinegar (No. 399).
Obs.—The French call this “Sauce Robert” (from the name of the cook who invented it), and are very fond of it with many things, which Mary Smith, in the “Complete Housekeeper,” 8vo. 1772, p. 105, translates ROE-BOAT-SAUCE. See Obs. to No. 529.