Set aside 1 cup flour. In a large bowl, mix remaining flour, sugar, salt and yeast. Stir in hot water and margarine. Mix in only enough reserved flour to make soft dough. On floured surface, knead 4 minutes.

On greased baking sheet, roll dough to 14x10 inches. Spread dressing down center third of dough length. Top with layers of beef, cheese and sauerkraut. Cut 1-inch wide strips along sides of filling out to dough edges. Alternating sides, fold strips at an angle across filling. Cover dough; place sheet over large shallow pan half filled with boiling water for 15 min.

Brush with egg white; sprinkle with caraway seed. Bake at 400 degrees for 25 minutes or until done. Cool slightly; serve warm. Refrigerate leftovers; reheat to serve.