I got this recipe out of The Best Slow Cooked Recipes book. It's very easy to prepare and delicious. The meat is so tender that it literally falls apart.
Place in Crock Pot. Add chopped vegetables and Worcestershire sauce. Pour tomato sauce over meat and vegetables. Cover and cook on low 8-10 hours or on high 4-5 hours.
Just before serving, sprinkle with grated cheese.
NOTE: Recipe may be doubled for 5-quart Crock Pot. Cook the maximum time.