Cut cabbage, onion, carrot, celery, and bell pepper into bite-sized pieces.
Heat olive oil in a pot and sauté onion and garlic.
Add carrot, celery, bell pepper, and cabbage in order, and stir-fry together.
Pour in tomatoes (or canned tomatoes) and water.
Season with salt, pepper, and herbs (such as basil and oregano).
Simmer on medium-low heat for 20–30 minutes until the vegetables are cooked through.