Barley Soup is a tasty, healthy, and low fat soup recipe prepared with vegetables. The main ingredients of barley soup are carrots, celery, onions, mushrooms, tomatoes, vegetable broth, and barley. The soup is very easy to make, yet it takes time to get cooked properly. Barley soup is very thick due to beans and other vegetables and it is a meal in itself. Barley soup is a rich source of protein, carbohydrates, and fiber.