Dice onion, carrot, potato, celery, and tomato.
Heat olive oil in a pot and sauté the onions.
Add carrot, potato, and celery and sauté for 2-3 minutes.
Add tomato and water, then bring to a boil.
Season with bay leaves, salt, and pepper, and simmer over medium-low heat for 20 minutes.
Finish when the ingredients have softened.