Heat oven to 450 degrees F. Grease a 13 x 9-inch baking pan.
Sauce: Combine ingredients and cook until rhubarb is done.
Syrup: Combine sugar and water; cook for
5 minutes. Pour into prepared baking pan.
Roll: Sift together flour, baking powder, salt and sugar.
Cut in shortening. Add milk and stir lightly. Knead on floured board.
Roll into a 12-inch square, 1/3-inch thick. Brush with melted butter. Spread dough
with cut rhubarb and roll as for a jellyroll. Cut into 1 1/2-inch slices and place in syrup in pan.
Bake for 40 minutes. During baking, baste with the Sauce.