This grilled prime rib with mustard crust recipe is a wonderful main event for a holiday meal or festive gathering. Wow your friends and family with one of the best beef cuts available . With the natural flavors from the rib bones to the tender and juicy meat, this one aims to please. This one cooks the whole roast, which locks in flavors and juices as it cooks. Be sure to let it rest for at least 15 minutes, otherwise all that goodness may rush off the meat and onto your carving station.