Pearl Barley is classic but other grains can be used such as farro or wheat berries, or even pasta
“Broth” - substitute for “Broth,” use bouillon cubes and water. Add wine, red wine will compliment. Adjust volume and broth flavor for taste. If you are not a vegetarian, beef broth or bouillon is a classic flavor enhancer.
An immersion blender can be used to quickly mix and puree the soup creating a thicker broth.
Other vegetables can be used such as potato, frozen green beans, frozen corn, frozen peas, zucchini, spinach, cabbage, kale, winter squash or canned beans. Be sure that soft vegetables are added at the end of cooking so they are not too cooked. Basically any left-over vegetables can be used.