Cut onions, carrots, celery, tomatoes, and other vegetables into bite-sized pieces.
Heat olive oil in a pot and sauté onions, carrots, and celery.
Add tomatoes and other prepared vegetables, and continue to sauté.
Pour in water and vegetable broth, then bring to a boil.
Season with bay leaves, pepper, salt, etc.
Simmer over medium heat for 20–30 minutes until all the vegetables are fully cooked.