Heat gas or charcoal grill. In small bowl, mix flour and brown sugar. Cut in cold butter with fork until mixture looks like dry bread crumbs (use fingers if necessary); set aside. Cut 18x8-inch sheet of heavy-duty foil; bring up foil to form sides. Spread streusel mixture evenly in foil; set aside. In small bowl, mix granulated sugar, cinnamon and ginger; set aside.