Take large young walnuts while their shells are quite soft so that you can stick the head of a pin into them. Pare them very thin till the white appears; and as you do them, throw them into spring or pump water in which some salt has been dissolved. Let them stand in that water six hours, with a thin board upon them to keep them down under the water. Fill a porcelain kettle with fresh spring water, and set it over a clear fire, or on a charcoal furnace. Put the walnuts into the kettle, cover it, and let them simmer (but not boil) for about ten minutes. Then have ready a vessel with cold spring water and salt, and put your nuts into it, taking them out of the kettle with a wooden ladle. Let them stand in the cold salt and water for a quarter of an hour, with the board keeping them down as before; for if they rise above the liquor, or are exposed to the air, they will be discoloured. Then take them out, and lay them on a cloth covered with another, till they are quite dry. Afterwards rub them carefully with a soft flannel, and put them into a stone jar; laying among them blades of mace, and sliced nutmeg, but no dark-coloured spice. Pour over them the very best vinegar, and put on the top a table-spoonful of sweet oil.