Wash, pare and cut potatoes in one-third inch pieces, there should be three cups; parboil three minutes, and drain. Add one-third cup of butter, and cook on back of range until potatoes are soft and slightly browned. Melt two tablespoons of butter, add a few drops of onion juice, two tablespoons of flour, and pour on gradually one cup of hot milk, season with salt and paprika, then add one well-beaten egg yolk. Pour sauce over potatoes and sprinkle with finely chopped parsley.
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