1 (10 pound) prime rib roast
6 cloves garlic, sliced
salt and ground black pepper to taste
1/2 cup Dijon mustard
Preheat the oven to 500 degrees F (260 degrees C).
Make slits all over the roast by pricking with a small knife.
Insert slivers of sliced garlic.
Season the roast with salt and pepper, then spread generously with mustard. Place on a rack in a roasting pan, and cover.
Roast for 60 minutes in the preheated oven.
Turn off oven.
Leave oven closed, and do not peek for 90 minutes. T
he internal temperature of the meat should be at least 140 degrees F (60 degrees C) for medium-rare, or 155 degrees F (68 degrees C) for medium.