1. In a large pot, sauté the onions, carrots, and celery in olive oil over medium heat until the vegetables are tender and just start to brown (about 10-15 minutes).
3. After that, add the diced tomatoes, potatoes, cabbage, and veggie stock. Bring to a boil, reduce the heat to medium low, and simmer for about 35-40 minutes, until the vegetables are very tender.