Cut cabbage, onion, carrot, bell pepper, celery, and tomato into bite-sized pieces.
Add olive oil to a pot and sauté onion and celery.
Add carrot and bell pepper and stir-fry together.
Add cabbage and tomato, then continue to stir-fry.
Pour in water and tomato sauce, then bring to a boil.
Season with salt and pepper.
Simmer over low heat until the vegetables are tender.