1. Put roasting tray on hob. 2. Spoon fat off. 3. Make 500ml stock from the lamb stock cubes. 4. Heat juices in tray on hob. 5. Stir in stock a little at a time. 6. Add the wine and rosemary on high heat. 7. Sieve in the flour and then add the butter. 8. Add the mint. 9. Heat until thickened. 10. Enjoy!