2. Finely chop the onion and celery, add to the beef and saute for 2 minutes.
3. Peel and dice the potatoes. Add potatoes, carrots, tomatoes, and vegetable broth. Bring to a boil, then reduce heat, cover, and simmer gently for 45 minutes until veggies are soft and beef is tender.
4. Add the spinach, cover and cook for 5 minutes until spinach wilts. Give it one more quick stir, then remove from heat and puree to desired consistency, adding a little more vegetable broth or water if necessary.