To the slow cooker, add the browned beef, onion, garlic, carrot, celery, italian herbs, tomato paste, canned tomatoes, beef stock, boiling water and worcestershire sauce. Give it all a good mix.
1 kg beef cheek, 1 brown onion, 2 cloves garlic, 2 carrots, 3 celery sticks, 1 tablespoon italian herbs, 2 tablespoons tomato paste, 400 g canned diced tomatoes, 1 cup beef stock, 1 cup boiling water, 2 tablespoons worcestershire sauce