Cut cabbage, onion, carrot, celery, and bell pepper into bite-sized pieces.
Heat olive oil in a pot and sauté the onions.
When the onions become translucent, add the remaining vegetables and stir-fry for another 2–3 minutes.
Pour in canned tomatoes and water, cover with a lid, and bring to a boil.
Season with salt and pepper to taste.
When the vegetables are tender, it's ready.