Finely chop vegetables such as onions, carrots, and celery.
Add olive oil to a pot and sauté the vegetables.
Add tomatoes, cabbage, and bell peppers, and continue sautéing.
Pour in water and tomato sauce, then bring to a boil.
Season with salt and pepper, and cook over medium heat for 20 to 30 minutes.
Serve the finished soup in a bowl.