In a large skillet, brown meat, half at a time, in hot oil. Drain well.
Meanwhile, in a 3-1/2-, 4-, 5-, or 6-quart crockery cooker, combine potatoes, carrots, onion, and celery. Add frozen beans, bouillon granules, Worcestershire sauce, thyme, salt, and pepper. Stir in browned meat, undrained tomatoes, and water
Cover and cook on low-heat setting for 10 to 12 hours, or on high-heat setting for 5 to 6 hours. Makes 6 servings.