To the slow cooker, add the chopped onion, garlic, carrot, celery, Mediterranean meal base sauce, tinned tomatoes, red wine, and beef stock. Stir to combine.
1 brown onion, 2 cloves garlic, 1 carrot, 3 celery sticks, 175 g Mediterranean meal base sauce, 400 g tomatoes, 0.5 cup red wine, 1 cup beef stock