Heat the stock in a large soup pot, to boiling. Add the carrots, celery and herbal seasonings. Return to a boil, and then simmer until the vegetables are tender. Add the green beans and peas, simmering an additional 10 minutes, or until they are tender. Stir in the chopped turkey or chicken and pre-cooked rice. If leftover gravy is available from the roast poultry, stir in to enrich the soup. Season to taste with salt and pepper, and allow simmering for 10 additional minutes to blend flavors. Serve hot.