Cut onion, carrot, cabbage, and celery into bite-sized pieces.
Heat olive oil in a pot and sauté the onion.
Add carrot, celery, and cabbage, and stir-fry together.
Add chopped tomatoes and water, then bring to a boil.
Add bay leaf, salt, and pepper. Cover and simmer on medium-low heat for 20 minutes.
Remove the bay leaf and finish by adding lemon juice to taste.