Black Pepper-Crusted Standing Rib Roast au Jus

Ingredients

• 0.5 cup wine dry red
• 4 large garlic clove minced
• 2 tablespoons pepper black
• 2.3 cups beef broth 
• 8 servings onion red
• 0.5 teaspoon salt 
• 8.5 pound prime rib roast with bones), top fat trimmed
• 12 tablespoons butter unsalted room temperature ()
• 8 servings vegetable oil 
• 1 large bunch watercress 

Equipment

• bowl
• oven
• whisk
• roasting pan
• kitchen thermometer
• aluminum foil
• measuring cup

Directions

1. Place roast, fat side up, in roasting pan.
2. Brush exposed ends of roast with vegetable oil.
3. Sprinkle roast lightly all over with salt.
4. Mix 8 tablespoons butter, 2 tablespoons cracked pepper, minced garlic, and 1/2 teaspoon salt in small bowl. Reserve 2 tablespoons pepper butter for sauce.
5. Spread remaining pepper butter all over top (fat side) of roast. (Can be prepared 1 day ahead. Cover roast and reserved pepper butter separately; chill.)
6. Position rack in bottom third of oven and preheat to 350°F. Roast rib roast until instant-read thermometer inserted into thickest part of meat registers 125°F for medium-rare, about 2 hours 45 minutes.
7. Transfer roast to platter and cover loosely with foil; let rest 30 minutes (temperature will rise slightly as roast stands).
8. Strain pan juices from roasting pan into measuring cup. Skim off any fat from top of pan juices; discard fat. Return pan juices to roasting pan; set pan over 2 burners.
9. Add broth and wine to roasting pan and boil over high heat until liquid is reduced to 1 1/4 cups, scraping up any browned bits from bottom of pan, about 6 minutes.
10. Whisk in reserved pepper butter and remaining 4 tablespoons plain butter. Season with more salt and pepper, if desired.
11. Surround roast with Roasted Red Onions.
12. Garnish with watercress. Slice roast and serve with sauce.