Cut cabbage, onion, carrot, celery, bell pepper, and tomato into bite-sized pieces.
Heat olive oil in a pot and sauté the onion first.
Add the remaining vegetables to the pot and sauté for 2–3 minutes.
Add 500ml of water, canned tomatoes, salt, and pepper, then bring to a boil.
Simmer over medium heat for 20–30 minutes until the vegetables are tender.