Cut onion, carrot, celery, and tomato into bite-sized pieces.
Add olive oil to a pot and sauté the onion, carrot, and celery.
When the vegetables become translucent, add tomato, cabbage, and bell pepper and sauté.
Pour in water or vegetable broth and bring to a boil.
Season with bay leaf, herbs, salt, and pepper.
Simmer over low heat until the ingredients are cooked through.