Good served with my oriental coleslaw
                    In a large bowl, combine the ground chuck and water chestnuts. Shape into 6 patties. Place in a 9 x 13-inch dish.
In a small bowl, combine the soy sauce, sherry or broth, onions, brown sugar, garlic and ginger. Pour 1/2 cup over patties; cover and refrigerate for 2-3 hours or overnight.
Cover and refrigerate remaining marinade for basting.
Coat grill rack with nonstick cooking spray before starting the grill. Drain and discard marinade.
Grill patties, covered over medium heat 5-7 minutes on each side or until meat is cooked through.
Serve on lettuce-lined buns.