Butter tender, juicy, and perfectly medium rare this classic roast is much easier than you'd think. A quick cook at high heat creates a delicious, herbal crust then the heat is turned down for slow cooked succulence.
Mix the pepper, salt, herbes de provence, garlic powder, and onion powder together and pat all over the roast covering as much surface as possible.
Wrap tightly in plastic wrap and refrigerate.
When Ready to Cook
Remove the roast from the refrigerator and unwrap.
Let come to room temperature for 2-4 hours. This is critical for an evenly cooked roast.
Preheat the oven to 450F.
Place the prime rib on the roasting rack in the roasting pan, fat side up.
Roast 15 minutes then turn the oven down to 325F and continue roasting about 1 1/2 hours.
Remove roast from oven when meat thermometer registers 120F in the center if you are looking for medium rare which is 130-135F.
Let stand for 15-20 minutes with aluminum foil loosely covering the roast to keep it warm. This lets the juices settle back into the meat. I cut it when it reaches about 120F-125F.