In large bowl, combine 1 1/2 cups flour, undissolved yeast, sugar and salt. Heat water and butter until very warm (125? to 130?F); stir into dry ingredients. Stir in enough additional flour to make soft dough. Knead on light floured surface until smooth and elastic, about 4 minutes.
Line baking sheet with aluminum foil; grease foil and set aside. On lightly floured surface, roll dough to 14- ? 10-inches. Transfer to prepared baking sheet. Layer with beef, sauerkraut, dressing and cheese. Make cuts from filling to dough edges at 1-inch intervals along sides of filling. Alternating sides, fold strips at an angle across filling; cover. Let rise in warm, draft-free place until light, about 30 minutes.
Brush with egg white; sprinkle with caraway seed. Bake at 400?F for 35 to 40 minutes or until done. Serve warm. Refrigerate leftovers; reheat to serve. Makes about 12 (1-inch) slices.
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