1. In a large pot on medium-high heat, add a good splash of EVOO and braise oxtails. Place braised oxtails on a plate and set aside.
2. Using the same pot reduce heat to medium, add onion and leek and cook until brown.
3. Reduce heat to low, add remaining ingredients and braised oxtails back to the pot and simmer for 2.5-3 hrs.
4. Use a fork to gently pull meat off the oxtails and simmer for a further 15 mins.
5. Serve and enjoy.