Set aside 1 cup flour. Mix remaining flour, salt, Italian seasoning and yeast. Stir in hot water and margarine. Mix in enough reserved flour to make soft dough. Knead 4 minutes. Roll dough to 16 x 6-inch rectangle. Spread sauce on center length. Top with cheese and any additional topping. Seal long edges over filling; seal ends. Shape into crescent on greased baking sheet; cover. Place boiling water in large shallow pan. Place sheet over pan; let dough rise 15 to 20 minutes. Make several slashes on top. Brush with egg white. Bake at 375° for 25 minutes, or until done. Cool slightly; serve warm. Makes 1 loaf.