This section is from the book "The Boston Cooking-School Cook Book", by Fannie Merritt Farmer. Also available from Amazon: Original 1896 Boston Cooking-School Cook Book.
Soak lambs' kidneys one hour in lukewarm water. Drain, clean, cut in slices, season with salt and pepper, dredge with flour, and saute in butter. Fry one sliced onion and one-half shallot, finely chopped, in three tablespoons butter until yellow; add three tablespoons flour and one and one-fourth cups Brown Stock. Cook five minutes, strain, and add one-half cup mushroom caps peeled and cut in quarters; season with salt and pepper, add kidneys, and serve as soon as heated. White wine may be added if desired.
Mix one-half cup stale bread crumbs, one-half small onion, finely chopped, and one-half tablespoon finely chopped parsley. Season with salt and pepper and moisten with beaten egg. Spread mixture on thin slices of bacon, fasten around pieces of lambs' kidney, using skewers. Bake in a hot oven twenty minutes.
 
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