Roll the pork into a neat cylinder and tie with butchers' string. Place the pork into a roasting tray and roast for 30 minutes. Reduce the oven temperature to 180C/350F/Gas 4 and cook the pork for ...
You might see many recipes that fold the narrow, tapered end underneath the tenderloin. I’ve never had great results doing that. I cut off the tapered end and cook it separately or freeze it.