Set aside 1 cup flour. Mix remaining flour, sugar, salt, and yeast in mixer bowl. Stir in hot water and margarine. Add enough reserved flour to make soft dough. Knead 4 minutes. Roll dough to 14 x 20 cm rectangle. Place on greased baking sheet. Spread filling down center third. Cut 3 cm wide strips from sides of filling to dough edges. Alternately fold strips over filling. Cover. Place boiling water in large shallow pan on counter. Place baking sheet over pan and let dough rise for 15 min. Bake 20 min at 375 or until done. Remove from sheet and cool on wire rack. Can drizzle with a confectioner's sugar glaze, if desired. Fran's notes: on a hot, humid day, I didn't need the extra cup of flour. I used a dozen oz can of solo almond filling instead of the one listed here. I didn't have any 10x sugar, but a glaze would have been nice. Otherwise, I'll use a butter or egg wash to 'pretty' it up. This is definitely a keeper and I can't wait to try apricot, etc. filling.