This Costco Prime Rib recipe is a slow roasted and juicy recipe, which is seasoned with garlic and fresh rosemary. It’s a restaurant-quality dish, ready in about 3 hours, including resting time.
Jump to RecipeCostco Prime Rib Recipe Ingredients
- 5 pounds beef prime rib* (if larger, double the spices/seasonings)
- Sea salt
- 2 teaspoons freshly ground black pepper
- 2 teaspoons fresh rosemary
- 1 teaspoon fresh thyme
- 8 cloves garlic, minced
- 1/4 cup olive oil
- horseradish, for serving (optional)
How To Make Costco Prime Rib
- Bring meat to room temperature: Remove the prime rib from the refrigerator one hour before cooking. Season it generously on all sides with salt, cover it loosely, and let it sit on the counter.
- Preheat and prepare seasonings: Adjust your oven rack so the roast will be in the center, then preheat to 500°F. In a small bowl, mix together 1 ½ teaspoons salt, the black pepper, rosemary, thyme, minced garlic, and olive oil to create a paste.
- Season the roast: Pat the room-temperature roast dry with paper towels. Rub the garlic and herb paste all over the entire surface of the prime rib. Place the roast in a cast iron skillet or roasting pan. If it’s bone-in, place it with the bones acting as a natural rack. If it’s boneless, set it on a small wire rack inside the pan.
- Roast at high heat: Place the prime rib in the 500°F oven and roast for 15 minutes.
- Continue roasting at lower heat: After 15 minutes, reduce the oven temperature to 325°F. Continue roasting until a meat thermometer registers your desired temperature (about 13-14 minutes per pound for medium-rare).
- Rest the roast: Remove the prime rib from the oven when it is 5-10 degrees below your final desired temperature. Tent it loosely with foil and let it rest for at least 30 minutes. The internal temperature will continue to rise as it rests.
- Carve and serve: To carve, slice the roast against the grain into ½-inch thick slices. Serve with horseradish sauce, if desired.
Recipe Tips
- How to get the most flavorful roast? For the best flavor, choose a bone-in prime rib. The bones add a significant amount of flavor during the roasting process. You can ask the butcher to cut the bones off and tie them back on, which makes carving much easier.
- What’s the most important step for even cooking? Do not skip the step of letting the roast come to room temperature for an hour before cooking. A cold roast will cook unevenly, with the outside being overdone before the inside reaches the correct temperature.
- How do I know when my prime rib is done? The only way to know for sure is to use a reliable instant-read meat thermometer. This is not a recipe to guess on. Remember to pull it from the oven 5-10 degrees before it reaches your target temperature.
- Why let the prime rib rest? Resting is crucial. It allows the juices that have been pushed to the center of the roast to redistribute throughout the meat, resulting in a much juicier and more flavorful slice.
What To Serve With Prime Rib
This showstopper main course is perfect with classic steakhouse sides.
- Creamy horseradish sauce
- Au jus made from the pan drippings
- Mashed or roasted potatoes
- Yorkshire pudding
- Creamed spinach or roasted asparagus
How To Store Prime Rib
- Refrigerate: Store leftover sliced prime rib in an airtight container in the refrigerator for up to 4 days.
Prime Rib Nutrition Facts
- Calories: 729kcal
- Carbohydrates: 1g
- Protein: 31g
- Fat: 66g
Nutrition information is estimated and may vary based on ingredients and cooking methods used.
FAQs
Yes, this is a critical step for a large roast like prime rib. It ensures the meat cooks evenly from edge to center.
Starting the roast at a very high temperature (500°F) for a short time creates a delicious, deeply browned crust on the outside. Lowering the temperature for the remainder of the time allows the inside to cook slowly and evenly to the perfect temperature without burning the exterior.
Yes, a boneless prime rib will work perfectly. Just be sure to place it on a wire rack inside your roasting pan so that the hot air can circulate all around it.
Try More Recipes:
Costco Prime Rib Recipe
Course: DinnerCuisine: AmericanDifficulty: Easy10
servings10
minutes1
hour45
minutes729
kcalA perfect holiday or special occasion roast, seasoned with a garlic and fresh herb rub, slow-roasted to juicy perfection with a delicious brown crust.
Ingredients
5 pounds beef prime rib (bone-in or boneless)
Sea salt
2 tsp freshly ground black pepper
2 tsp fresh rosemary
1 tsp fresh thyme
8 cloves garlic, minced
1/4 cup olive oil
Horseradish, for serving (optional)
Directions
- Let prime rib rest at room temperature for 1 hour after seasoning generously with salt.
- Preheat oven to 500°F. Combine pepper, rosemary, thyme, garlic, and olive oil to make a paste.
- Pat the roast dry and rub the herb paste all over it. Place in a roasting pan (on the bones or on a rack).
- Roast at 500°F for 15 minutes.
- Reduce oven temperature to 325°F and continue roasting until a meat thermometer reaches desired temp (approx. 13-14 mins/lb for medium-rare).
- Remove from oven, tent with foil, and let rest for at least 30 minutes.
- Carve against the grain and serve.
Notes
- Using a bone-in prime rib will result in a more flavorful roast.
- An instant-read meat thermometer is essential for this recipe to ensure perfect results.
- Do not skip the resting period; it is critical for a juicy, tender roast.
- Remember to pull the roast from the oven 5-10 degrees before your target temperature, as it will continue to cook while it rests.
