Bean Sprouts should be rinsed and drained. Water Chestnuts should be rinsed, drained and sliced. Hamburger buns should be split and toasted. ~------------------------------------------------------------------------Cook and stir the meat and onion in a large skillet until the onion is tender. Drain off the excess fat. Mix the water, cornstarch, soy sauce, molasses and ginger and stir into the meat mixture. Add the bean sprouts and water chestnuts. Cook, stirring constantly, until the mixture thickens and boils, about 5 minutes. Serve on the toasted buns and pass the soy sauce. NOTE: For Chow Mien omit the buns. Serve the chow mien mixture over hot cooked rice or chow mien noodles.