Clean and cut onion, tomato, cabbage, celery, and carrot into bite-sized pieces.
Heat olive oil in a pot and sauté the onions.
When the onions become translucent, add the rest of the vegetables and stir-fry lightly.
Add canned tomatoes, water, salt, and pepper, and bring to a boil.
Simmer on medium-low heat for 20 to 30 minutes until the vegetables are tender.