Cut the onion, celery, carrot, and cabbage into bite-sized pieces.
Heat olive oil in a pot and sauté the onion, celery, and carrot.
When the vegetables become slightly translucent, add the cabbage and tomato.
Pour in enough water to cover the vegetables and bring to a boil.
Season with bay leaf, salt, and pepper.
Simmer over medium-low heat until the vegetables are tender.
Garnish with parsley or herbs as desired to finish.