Once mushrooms are browned, add back the medallions as well as more rosemary on top of pork and allow to simmer together for about 15 minutes to perhaps 20. Check internal temperature, safe to eat at 145F however I find that too pink/rare, so I allow the temp to climb to 155F, then while removing the meat, it still cooks and is able to reach temp to 160. Succulent and perfect!