No. 9 Sauce Piquante for Cold Meat
Slice two onions, fry them in butter; put them in a stewpan with a carrot, some sweet herbs, such as dried thyme or marjoram, two eschalots, some parsley and a clove of garlic; dredge in a spoonful of flour. When the carrot is perfectly done, mash it in the stewpan with a wooden spoon, and when smooth add to it a cup of soup stock. When this boils up, throw in a cup of strong vinegar. Add salt and pepper, and strain.