This is a fabulous soup and the leftovers taste even better. This soup can be prepared in advance then frozen in an airtight containers for up to 2-3 months. To prepare from frozen, thaw soup, pour into pot, bring just to a boil, then simmer for 10-15 minutes.
Add to a large soup kettle or Dutch oven, beef, onion, carrots, celery, tomatoes, water, salt & pepper. Bring just to a boil; reduce heat, cover and simmer 1 hour over low heat, skimming and stirring occasionally.
Add in potatoes. Cook over low heat for 30 minutes or until potatoes are tender.
Add in green beans, corn, and barley. Cook over low heat for about 10 minutes more.
Remove soup from heat. Add more salt and pepper if desired and sprinkle with 1/4 cup fresh, chopped parsley. Let stand for about 10 minutes before serving.