These nuts are in the best state for pickling when the shell is soft, and when they are so young that the outer skin can be penetrated by the head of a pin. They should be gathered when the sun is hot upon them.
If you have a large quantity, the easiest way to prepare them for pickling is to put them into a tub with sufficient lye to cover them, and to stir and rub them about with a hickory broom, till they are clean and smooth on the outside. This is much less trouble than scraping them, and is not so likely to injure the nuts. Another method is to scald them, and then to rub off the outer skin. Put the nuts into strong salt and water for nine or ten days; changing the water every other day, and keeping them closely covered from the air. Then drain and wipe them, (piercing each nut through in several places with a large needle,) and prepare the pickle as follows:—For a hundred large nuts, take of black pepper and ginger root of each an ounce; and of cloves, mace and nutmeg of each a half ounce. Pound all the spices to powder, and mix them well together, adding two large spoonfuls of mustard seed. Put the nuts into jars, (having first stuck each of them through in several places with a large needle,) strewing the powdered seasoning between every layer of nuts. Boil for five minutes a gallon of the best white wine vinegar, and pour it boiling hot upon the nuts. Secure the jars closely with corks and leathers. You may begin to eat the nuts in a fortnight.
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.
Gather them while the shells are very soft, and rub them all with a flannel. Then wrap them singly in vine leaves, lay a few vine leaves in the bottom of a large stone jar, put in the walnuts, (seeing that each of them is well wrapped up so as not to touch one another,) and cover them with a thick layer of leaves. Fill up the jar with strong vinegar, cover it closely, and let it stand three weeks. Then pour off the vinegar, take out the walnuts, renew all the vine leaves, fill up with fresh vinegar, and let them stand three weeks longer. Then again pour off the vinegar, and renew the vine leaves. This time take the best white wine vinegar; put salt in it till it will bear an egg, and add to it mace, sliced nutmeg, and scraped horseradish, in the proportion of an ounce of each and a gallon of vinegar to a hundred walnuts. Boil the spice and vinegar about eight minutes, and then pour it hot on the walnuts. Cover the jar closely with a cork and leather, and set it away, leaving the vine leaves with the walnuts. When you take any out for use, disturb the others as little as possible, and do not put back again any that may be left.