Cut the cabbage, onion, carrot, celery, and bell pepper into bite-sized pieces.
Drizzle olive oil into a pot and sauté the onion.
Add all the other vegetables and lightly stir-fry them.
Pour in canned tomatoes and water, and bring to a boil.
Season with bay leaf, salt, and pepper.
Once it starts boiling, simmer over medium-low heat for 20–30 minutes.