1. Wash and chop the leeks, green beans, celery, and broccoli into small pieces.

2. Heat some oil in a pan and sauté the leeks until they are soft.

3. Add the green beans and celery and sauté for another 5 minutes.

4. Add the broccoli and tomatoes and sauté for another 5 minutes until the vegetables are cooked.

5. Season with salt and pepper and serve.