Horseradish And Garlic Prime Rib Recipe | Tyler Florence | Food Network

Ingredients

• 1 (3-rib) prime rib beef roast, about 6 pounds
• 5 garlic cloves, smashed, plus 2 heads garlic, halved
• 1/2 cup grated fresh or prepared horseradish
• 1/2 cup sea salt
• 1/4 cup freshly ground black pepper
• 1/2 cup extra-virgin olive oil
• 2 carrots, peeled and chopped
• 2 parsnips
• 1 red onion, halved
• 1 tablespoon unsalted butter
• Extra-virgin olive oil
• 2 pounds assorted mushrooms, such as cremini, oyster, shiitake, chanterelle, or white, trimmed and sliced
• Leaves from 2 fresh thyme sprigs
• Sea salt and freshly ground black pepper
• 1/2 cup Cabernet Sauvignon
• 1/4 cup reserved beef broth (drippings from roast) or low-sodium canned broth
• 1/4 cup heavy cream
• 1 tablespoon minced fresh chives