Cut cabbage, onion, carrot, celery, and bell pepper into bite-sized pieces.
Heat olive oil in a large pot and sauté the onion.
Add the cabbage, carrot, celery, and bell pepper, and stir-fry for about 2 more minutes.
Add chopped tomatoes and water, and bring to a boil.
Add chicken stock, salt, and pepper, and simmer over medium-low heat for 15-20 minutes.
Finish with herbs or a splash of lemon juice according to your preference.