This section is from the book "The White Ribbon Cook Book", by Kathryn Armstrong. Also available from Amazon: The White Ribbon Cook Book.
Plunge some mutton kidneys in boiling water; open them down the center, but do not separate them; peel and pass a skewer across them to keep them open, pepper, salt, and dip them into melted butter, broil them over a clear fire on both sides, doing the cut side first; remove the skewers, have ready some maître d'hotel butter, viz.: butter beaten up with chopped parsley, salt, pepper, and a little lemon juice. Put a small piece in the hollow of each kidney, and serve very hot.
4 kidneys, 1/2 a small onion, 1 oz. butter, 3 teaepoonfuls of flour, pepper and salt to taste.
Cut the kidneys in small pieces, and roll them in flour; chop the onion small, and fry with the pieces of kidney in the butter until brown. Then add the pepper, salt, and enough cold water to cover them, and stew very gently for an hour. Thicken with the flour a few minutes before done, and serve very hot.
 
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