Finely chop the onion, celery, carrot, and tomato.
Heat olive oil in a pot and sauté the onion, celery, and carrot.
Add the tomato, chopped cabbage, and zucchini, and briefly sauté further.
Add water and bay leaves and bring to a boil.
Season with salt and pepper.
When the ingredients are soft, turn off the heat and it's ready.