You may pickle butternuts green in the same manner.
Take very small onions, and with a sharp knife cut off the stems as close as possible, and peel off the outer skin. Then put them into salt and water, and let them stand in the brine for six days; stirring them daily, and changing the salt and water every two days. See that they are closely covered. Then put the onions into jars, and give them a scald in boiling salt and water. Let them stand till they are cold; then drain them on a sieve, wipe them, stick a clove in the top of each and put them into wide-mouthed bottles; dispersing among them some blades of mace and slices of ginger or nutmeg. Fill up the bottles with the best white wine vinegar, and put at the top a large spoonful of salad oil. Cork the bottles well.
Peel some very small white onions, and lay them for three days in salt and water changing the water every day. Then wipe them, and put them into a porcelain kettle with equal quantities of milk and water, sufficient to cover them well. Simmer them over a slow fire, but when just ready to boil take them off, and drain and dry them, and put them into wide-mouthed glass bottles; interspersing them with blades of mace. Boil a sufficient quantity of distilled white wine vinegar to cover them and fill up the bottles, adding to it a little salt; and when it is cold, pour it into the bottles of onions. At the top of each bottle put a spoonful of sweet oil. Set them away closely corked.
Take small fresh-gathered button mushrooms, peel them carefully with a penknife, and cut off the stems; throwing the mushrooms into salt and water as you do them. Then put them into a porcelain skillet of fresh water, cover it closely, and set it over a quick fire. Boil it as fast as possible for seven or eight minutes, not more. Take out the mushrooms, drain them, and spread them on a clean board, with the bottom or hollow side of each mushroom turned downwards. Do this as quickly as possible, and immediately, while they are hot, sprinkle them over with salt. When they are cold, put them into a glass jar with slight layers of mace and sliced ginger. Fill up the jar with cold distilled or white wine vinegar. Put a spoonful of sweet oil on the top of each jar, and cork it closely.
Take a quart of large mushrooms and (having trimmed off the stalks) rub them with a flannel cloth dipped in salt. Then lay them in a pan of allegar or ale vinegar, for a quarter of an hour, and wash them about in it. Then pat them into a sauce-pan with a quart of allegar, a quarter of an ounce of cloves, the same of allspice and whole pepper, and a tea-spoonful of salt. Set the pan over coals, and let the mushrooms stew slowly for ten minutes, keeping the pan well covered. Then take them off, let them get cold by degrees, and put them into small bottles with the allegar strained from the spice and poured upon them.
It will be prudent to boil an onion with the mushrooms, and if it turns black or blueish, you may infer that there is a poisonous one among them; and they should therefore be thrown away. Stir them for the same reason, with a silver spoon.