Take your buttons, clean 'em and cut 'em in three or four pieces, put them into a large sauce-pan to stew in their own liquor, put to them a little Jamaica and whole pepper, a blade or two of mace, and a little salt, cover it up, let it stew over a slow fire whilst you think they are enough, then strain from them their liquor, and put to it a little white wine vinegar or alegar, which you please, give it a boil together, and when it is cold put it to your mushrooms, and keep them for use.
You may pickle flaps the same way.