Cover them with water, and stew it slowly for an hour, skimming it well.
Pour in three quarts of water, and stew it gently an hour and a half.
Stew it slowly for at least four hours or more, in proportion to its size.
Cover the pan closely, and let it stew till the kidney is tender.
It will take at least five hours to stew; or more, in proportion to its size.