Roll 1/2 dough on floured board into a rectangle, 1/2-inch thick.
Spread filling all over top (then sprinkle with chopped English walnuts, if desired). Roll like a jelly roll and place in refrigerator.
When firm, slice and bake 10 to 12 minutes at 350° or 10 minutes at 375° (top of cookie may be sprinkled with sugar and top with 1/2 walnut before baking).