In A Large Skillet, Saute Onions In Butter Until Browned And Caramelized; Remove With A Slotted Spoon And Keep Warm. In The Same Skillet, Cook Beef Over Medium Heat Until No Longer Pink; Drain. Stir In The Flour, Brown Sugar, Cumin, Salt And Pepper Until Blended. Gradually Add The Broth; Cook For 8 Minutes Or Until Liquid Is Absorbed. Stir In Reserved Onion. Unroll Dough And Separate Into Four Rectangles. Separate Each Rectangle At Perforation Into Two Triangles (See Fig. 1). Pinch Two 6-In. Sides Together To Form A Triangle (See Fig. 2). Repeat With Remaining Dough. Place Point Of One Triangle Near The End Of A Greased Baking Sheet. Place Point Of Second Triable In Center Of First Triangle. Repeat With Remaining Triangle (See Fig. 3). Spoon Beef Mixture In A 1-1/2-In.-Wide Strip Down The Center; Sprinkle With Mozzarella Cheese. Starting At One End, Fold Alternating Points Across Filling. Pinch Ends To Seal. Sprinkle With Parmesan Cheese. Bake At 375