In a Dutch oven, cook beef and onions over medium heat until meat is no longer pink, breaking it into crumbles; drain. Add the tomatoes, carrots, celery, potatoes, water, rice, salt and pepper; bring to a boil. Reduce heat; cover and simmer 30 minutes or until vegetables and rice are tender. , Uncover; simmer 20-30 minutes longer or until thickened to desired consistency. Freeze option: Freeze cooled stew in freezer containers. To use, partially thaw in refrigerator overnight. Heat through in a saucepan, stirring occasionally; add a little water if necessary.