If the chops have been in the fridge, bring them up to room temperature for up to an hour before cooking. Heat the oven to 180C/160C fan/gas 4. Heat the remaining oil in an ovenproof frying pan over a medium heat. Scrape any excess marinade from the chops, then fry fat-side down, holding the chops with tongs, to render the fat. Once the fat has started to colour and crisp at the edges, fry the chops on one side for 2 mins. Turn over and repeat, then transfer the pan to the oven and cook for 8-10 mins, or until the mutton has browned and the fat has rendered, but the inside is still a little pink. Remove from the oven and leave to rest for 5 mins.