1. Saute onions with olive oil, salt, and pepper until translucent.
2. Set aside.
3. Dice potatoes, carrots, and celery.
4. Set aside.
5. In a large sauce pan, whisk chicken broth, crushed tomatoes, and tomato past until smooth.
6. Add vegetables and stewed tomatoes.
7. Simmer on LOW for 30-45 minutes, or until carrots and potatoes are soft.