Nut Strudel
["1/4 lb. soft butter", "1/2 c. sugar", "1/2 pt. sour cream", "4 egg yolks", "1 cake yeast", "5 to 5 1/2 c. flour", "2 lb. walnuts, chopped fine", "1 1/2 c. confectioners sugar"]
["Dissolve yeast in 1/2 cup warm water.", "Mix butter, sugar, sour cream, egg yolks and flour with the yeast and water.", "Mix dough well and let it rise for 2 to 2 1/2 hours.", "Mix nuts and confectioners sugar together.", "Beat 4 egg whites until stiff and add to nut mixture.", "If too thick, add a little milk.", "Roll dough 1/8-inch thick and spread with nut mixture.", "Roll tight.", "Let rise again until double in size.", "Bake in a greased pan at 350\u00b0 for about 20 or 25 minutes.", "Makes 2 rolls.", "Can be iced."]
["butter", "sugar", "sour cream", "egg yolks", "cake yeast", "flour", "walnuts", "confectioners sugar"]