preheat oven to 425. in a large skillet, saute hamburger meat and onion in margerine till meat is cooked through and onions are translucent,drain. put meat mixture back into the skillet, add worchestershire sauce and cream of mushroom soup, cover and simmer for 15 minutes. pour in lightly greased 2 qt. ovenproof casserole dish.
mix cornmeal and flour till well blended, add the shortening and cut it in, add milk and stir till dry ingredients are moistened. you may need a little more milk to get the batter consistency you want but it doesn't need to be too thin.
pour cornbread batter over the top of the meat mixture and bake till cornbread topping is done and golden brown. if not brown enough, turn on the broiler for a couple of minutes.