Always cook a prime rib at Christmas, let sit out a couple hours before cooking (not sure why) cover with olive oil, season and incase the entire rib in a kosher salt paste. Put on treager 12-15 min per pound around 225 degrees. I’m gonna try the reverse sear this year for the first time, when the meat temp hits about 110, gonna pull it from the treager and put in the oven at 500 for about 10 min. Pull out, cover with foil, and let sit for at least half hour. I really don’t think you can mess up prime rib, unless you over cook it of course.