To make the marinade, measure all the ingredients into a shallow dish and mix well. Add the short ribs and mix well to coat. Leave for 2 hours or overnight in the fridge, if possible, to marinate.
Add the tomato puree and cook for a minute. Add the passata and beef stock and bring to a simmer. Return the ribs to the pan, add the Worcestershire sauce and thyme and cover. Place in a 160oc ...