Add your choice of meat--beef or lamb--to this low-fat tomato-based barley and vegetable soup recipe.
Substitute regular barley for quick-cooking barley. In a large skillet brown cubed beef in hot oil. Drain off fat. In a 5- or 6-quart slow cooker combine beef and remaining ingredients. Cover and cook on low-heat setting for 8 to 10 hours or on high-heat setting for 4 to 5 hours.