Wash onion, cabbage, carrot, and bell pepper thoroughly, then cut them into bite-sized pieces.
Heat olive oil in a pot and sauté the onion.
Add cabbage, carrot, and bell pepper and sauté together.
Dice the tomato and add it to the pot to sauté.
Pour in water and tomato juice, then bring to a boil.
Season with bay leaf, salt, and pepper.
Simmer until the vegetables are soft and tender.
Remove the bay leaf and serve the finished soup in a bowl.