Ingredients
Equipment
Method
- Unwrap the prime rib from its packaging and pat it dry with paper towels. Place the prime rib, fat side up, onto a large rimmed baking sheet.
- Combine the seasoned salt with the black pepper in a medium bowl. Add the softened butter and garlic, mixing well until you have a smooth paste.
- Use your fingers to spread the seasoned garlic butter all over the prime rib roast, pressing it into all the areas.
- If you have time, place the buttered roast into the refrigerator for 24 hours, uncovered. This allows it to season during this resting time.
- When you are ready to cook the roast, remove it from refrigeration and let it rest on the counter, uncovered, for at least 2 hours.
- Preheat your electric roaster to 450 degrees F. (if your roaster only goes as high as 425 degrees F, use that temperature). Place the rack into the bottom of the roaster.
- After 10-12 minutes, the roaster should be preheated. Place the prepared prime rib roast onto the cooking rack.
- Cover the roaster with the lid. Cook the prime rib roast on high (425-450°F) for 25-30 minutes, or until the exterior of the beef is deep golden brown.
- Reduce the roaster temperature to 350 degrees F. Continue cooking the prime rib for 10-12 minutes per pound, or until it reaches 125 degrees F. at the center. This will take about 2 more hours. Cooking time will vary depending on your electric roaster.
- Remove the prime rib from the roaster and place it onto a large cutting board. Cover the prime rib with foil and let it rest for at least 15-30 minutes.
Notes
For a better exterior crust, season the roast ahead and let it rest uncovered in the refrigerator for 24 hours. This allows the seasoning to penetrate and draws out surface moisture, resulting in a caramelized exterior while keeping the inside juicy and tender. Cooking the prime rib roast in the electric roaster without liquid helps create a brown and caramelized exterior. Adding liquid will steam the prime rib, making it delicious but without the desired crust. It is recommended to cook prime rib just until it reaches rare or medium-rare doneness for the best taste. You can always cook slices a little more, but overcooked prime rib cannot be fixed. Ensure your prime rib roast rests before cooking. This allows the fat and juices to redistribute and the protein fibers to relax, leading to more even cooking and a delicious result. Cooking times vary based on your electric roaster. As a general guideline, a 12 lb. prime rib roast will take 12-14 minutes per pound for medium-rare doneness.