Wash the cabbage, onion, carrot, bell pepper, tomato, and celery thoroughly, then chop them into bite-sized pieces.
Drizzle olive oil in a large pot and sauté the onion.
Add all the other vegetables and stir-fry for another 2-3 minutes.
Pour in the tomatoes and water, then bring to a boil.
Reduce to low heat and simmer for 20-30 minutes until the vegetables are cooked.
Season with salt and pepper to taste to finish.