Heat duck fat in fry pan. Add oxtail and brown on all sides. Transfer meat to casserole. De-glaze fry pan with vinegar,add sugar and reduce to caramel. Add stout and reduce by 1/2. Add port, boil for 2 minutes. Add stock and pass onto oxtails. If necessary add a little water to cover. Place herbs and spice in middle of casserole, cover and cook for 2 hours on 115°C, gently simmering. Add onions and carrots and simmer for a further 11/2 hours or until meat comes away from the bone easily. Finish with figs or prunes. Source: My collection - Jeff Baker - J Bakers Bistro Moderne