Unattended Prime Rib Roast

Elevate your holiday table or special occasion dinner with this Unattended Prime Rib Roast recipe—an effortless yet impressive way to cook a tender, flavorful cut of beef. Featuring a perfectly seasoned crust made from kosher salt, black pepper, garlic powder, and fresh rosemary, this prime rib is oven-roasted to perfection with minimal hands-on effort. The key is in the simplicity: a high-heat sear locks in the flavors, followed by slow roasting for melt-in-your-mouth tenderness. Olive oil and softened butter add richness, while allowing the roast to rest ensures every slice is juicy and succulent. Whether bone-in or boneless, this recipe delivers a restaurant-quality centerpiece with stress-free preparation. Perfect for gatherings, this prime rib roast pairs beautifully with your favorite side dishes and guarantees a standing ovation at the dinner table!

Nutriscore Rating: 54/100

Prep Time:15 mins

Cook Time:240 mins

Total Time:255 mins

Servings: 6

Ingredients

• 5 pounds Prime rib roast (bone-in or boneless)
• 2 tablespoons Kosher salt
• 2 tablespoons Freshly ground black pepper
• 1 tablespoon Garlic powder
• 2 tablespoons Fresh rosemary (chopped)
• 2 tablespoons Olive oil
• 2 tablespoons Unsalted butter (softened)

Directions

Step 1

1. Take the prime rib roast out of the refrigerator at least 2-3 hours before cooking to bring it to room temperature. This ensures even cooking.

Step 2

2. Preheat your oven to 450°F (232°C).

Step 3

3. In a small bowl, combine kosher salt, black pepper, garlic powder, and chopped rosemary.

Step 4

4. Rub the prime rib all over with olive oil to help the seasoning stick.

Step 5

5. Generously coat the roast with the seasoning blend, pressing it into the meat to ensure even coverage.

Step 6

6. Place the roast fat-side up on a roasting rack set inside a roasting pan. If bone-in, the bones will act as a natural rack.

Step 7

7. Roast in the oven at 450°F (232°C) for 20 minutes to create a crispy, browned exterior.

Step 8

8. Reduce the oven temperature to 325°F (163°C) without opening the oven door.

Step 9

9. Continue roasting for approximately 15-20 minutes per pound for medium-rare doneness (internal temperature of 125°F/52°C) or 20-25 minutes per pound for medium doneness (internal temperature of 135°F/57°C).

Step 10

10. Once the desired temperature is reached, remove the roast from the oven and loosely tent it with aluminum foil. Let it rest for 20-30 minutes to allow the juices to redistribute.

Step 11

11. Spread the softened butter over the surface of the roast during resting for added richness and shine.

Step 12

12. Slice with a sharp carving knife, serve, and enjoy your perfectly cooked prime rib roast.

Nutrition Facts

Serving size	2359.5 grams (2359.5g)

Amount per serving	% Daily Value*
Calories	7154

Total Fat 584.90g	750%
Saturated Fat 234.70g	1174%
Polyunsaturated Fat 2.70g
Cholesterol 1763mg	588%
Sodium 4798mg	209%
Total Carbohydrate 16.30g	6%
Dietary Fiber 5.30g	19%
Total Sugars 0.20g
Protein 441.00g	882%

Vitamin D 173IU	864%
Calcium 350mg	27%
Iron 44mg	247%
Potassium 5473mg	116%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 74.2%

Protein: 24.9%

Carbs: 0.9%