Hands On: 20 minutes
Total: 8 hours
1. Place onion over the bottom of 3-1/2 quart or larger CROCK-POT slow cooker. Add the following ingredients in this order: carrots, celery, potatoes and beef. Sprinkle with thyme. Pour diced tomatoes and water over the top of the beef.
2. Cover; cook on LOW setting for 8 to 10 hours until meat is tender. Stir in tomato paste; cover.
3. Cook an additional 10 minutes on HIGH setting.