Walnuts may be pickled in the same manner.
The walnuts should he gathered while young and soft, (so that you can easily run a pin through them,) and when the sun is upon them. Rub them with a coarse flannel or tow cloth to get off the fur of the outside. Mix salt and water strong enough to bear an egg, and let them lie in it nine days, (changing it every two days,) and stirring them, frequently. Then take them out, drain them, spread them on large dishes, and expose them to the air about ten minutes, which will cause them to blacken the sooner. Scald them in boiling water, (but do not let them lie in it,) and then rub them with a coarse woollen cloth, and pierce everyone through in several places with a large needle, (that the pickle may penetrate them thoroughly.) Put them into stone jars, and prepare the spice and vinegar. To a hundred walnuts allow a gallon of vinegar, an ounce of cloves, an ounce of allspice, an ounce of black pepper, half an ounce of mace, and half an ounce of nutmeg. Boil the spice in the vinegar for five or six minutes; then, strain the vinegar, and pour it boiling hot over the walnuts. Tie up in a thin muslin rag, a tea-cupful of mustard seed, and a large table-spoonful of scraped horseradish, and put it into the jars with the walnuts. Cover them closely with corks and leathers.
Another way of pickling walnuts black, is (after preparing them as above) to put them into jars with the spices pounded and strewed among them, and then to pour over them strong cold vinegar.
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 five or six 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 best distilled vinegar, and put on the top a table-spoonful of sweet oil.