Heat oven to 350 (180C). Place the Dutch oven on the stovetop on a high heat. Add the beef stock, water, wine, chopped tomatoes, tomato paste, brown sugar, celery, carrot, onion, garlic and rump steak. Season and stir well. Cover and bring to the boil before transferring to the oven. Cook for 1 hour 45 minutes or until the beef has become tender and can easily be cut with a spoon.