To make the soup in the slow cooker add all the ingredients and cook according to the manufacturers' instructions.
For a quicker soup ask your butcher to cut the meat into smaller chunks.
If you prefer a chunkier soup, cook the soup initially with just in the beef stock and 30 minutes before the end of the cooking time, add chopped tomatoes instead of tomato passata.
Vegans
If you are serving vegans make a parallel soup with root vegetables and the same sauce. Remembering to use vegan cheese and stock cubes.