The Best Slow Roasted Prime Rib

This Slow Roasted Prime Rib recipe is absolutely the BEST! It is so easy to prepare and is juicy and delicious every time. The butter, garlic and herb rub makes this an entrée everyone will love. It's the perfect prime rib.

This showstopper garlic herb butter rubbed prime rib with a creamy horseradish sauce is perfect to serve for a holiday dinner, special occasions or just any time you want to enjoy an unforgettable dinner. Since a prime rib roast is typically 5-7 pounds, it's a great for a large family gathering or group of friends.

My favorite side dishes to serve with prime rib are cheddar stuffed potatoes, garlic butter mushrooms (the blue cheese in this recipe is fabulous along side the prime rib!) and honey mustard roasted Brussels sprouts. It's a meal that's unforgettable!

in the article/jump to

• why you'll love a slow roasted prime rib
• ingredients & substitutions
• expert tip
• what size prime rib roast should you buy
• recipe details - low and slow method for cooking a prime rib roast
• what temperature is prime rib cooked to?
• storage and reheating
• what to serve with prime rib
• more dinner recipe ideas
• recipe

why you'll love a slow roasted prime rib

Preparing a slow roasted prime rib roast is easier than you think. Don't be scared of making this rich, tender and juicy standing rib roast. With just a few easy steps, the oven does most of the work for you.

You'll love that this slow roasted prime rib recipe is

• A showstopper ~ Serving an entire roast makes for a dramatic dinner. Get ready for the oohs and ahhs.
• Unbelievable flavor ~ A prime rib muscle isn't heavily used. The result is extremely tender and juicy meat. The large fat cap surrounding the roast and the marbling throughout make for a piece of meat the is super flavorful and rich.
• Easy to prepare ~ Making a prime rib roast is easier than you think. There is little prep work to be done. And the oven and a wireless thermometer do most of the work.

ingredients & substitutions

Gather the ingredients to make this great slow roasted prime rib recipe. If substitutions can be made to the ingredients, they're listed. Scroll to the recipe card for full quantities of the ingredients.

• prime rib roast ~ Also know as standing rib roast or rib roast. They are sold as a bone-in rib roast or a boneless rib roast.
• salted butter
• garlic cloves ~ With a fabulous cut of meat such as this, skip garlic powder and use fresh garlic.
• fresh rosemary ~ Fresh is best! Skip dried herbs in this recipe.
• fresh thyme leaves
• fresh parsley
• kosher salt
• freshly ground black pepper
• prepared horseradish
• sour cream
• mayonnaise

expert tip

A prime rib roast can be an expensive cut of meat. But they do go on sale a few times of the year. Around holidays like Easter and Christmas you can get a great deal on a prime rib roast. Be on the lookout for sales and pick one up.

what size prime rib roast should you buy

It can be confusing on just how small or a prime rib roast to buy. The largest roasts have 6 rib bones and can weigh 12 to 16 pounds. That is one BIG roast! But smaller roasts are also available.

A good rule of thumb is to estimate 2 generous servings per bone. This means that a 4 bone prime rib roast is about 7 to 8 pounds and will serve 8 people.

The roast is also available boneless. But my preference is to get one with the bones attached. This will yield the most juicy and flavorful slow roasted prime rib.

recipe details - low and slow method for cooking a prime rib roast

This is a brief overview of the recipe. Scroll to the recipe card for the complete instructions.

1. Take the prime rib out of the refrigerator at least 1 1/2 hours before roasting it. If the roast is not room temperature, it'll take longer to roast and cook at an uneven rate.
2. Place the roast bone side down in a roasting pan. The bones will act as a roasting rack.
3. Rub all sides of the roast with the butter, garlic and herb seasoning mixture.
4. A wireless meat thermometer is the easiest and most foolproof way to cook a perfect slow roasted prime rib. Place the probe into the center of the roast and set the thermometer for the desired temperature.
5. Start the roast off in a very hot oven ~ 500 degrees F. This will make the outside of the prime rib a beautiful roasted brown. After 30 minutes, lower the oven to 325 degrees F to slow cook the roast for the most flavor. Also, this ensures that the center of the roast does not overcook. Cook the roast for an additional 11 to 15 minutes per pound.
6. When the prime rib reaches the desired temperature, remove it from the oven and place it on a cutting board. Cover with foil and let rest for 30 minutes. The roast will continue cooking and the juices will redistribute throughout the roast.
7. When ready to carve the roast, first cut off the bones. Slice the roast into at least 1-inch thick slices. Pour any juices from the cutting board over the sliced meat.

what temperature is prime rib cooked to?

Depending on how you like your prime rib ~ rare, medium rare, medium or medium well ~ the meat will have a certain internal temperature. A wireless meat thermometer is the most foolproof way to make a foolproof slow cooked prime rib roast.

The prime rib continues to cook and the temperature rises 5-10 degrees after it is taken out of the oven. Follow the temperatures below for a perfect prime rib roast.

• Rare ~ the center of the roast is bright red and pinkish toward the exterior. Remove the roast from the oven at 115 degrees F. The temperature will rise to 120 degrees F as the roasts rests.
• Medium rare ~ the center of the roast is very pink and and slightly brown toward the exterior. Remove the roast from the oven at 125 degrees F. The temperature will rise to 130 degrees F as the roasts rests.
• Medium ~ the center of the roast is light pink and brown toward the exterior. Remove the roast from the oven at 130 degrees F. The temperature will rise to 135 degrees F as the roasts rests.
• Medium well~ the center of the roast is brown as is the exterior. Remove the roast from the oven at 140 degrees F. The temperature will rise to 145 degrees F as the roasts rests.

storage and reheating

Follow these tips for storing and reheating prime rib will result in the best flavor.

Refrigerator ~ Completely cool the prime rib. Tightly wrap in plastic wrap. Store in the refrigerator for up to 5 days. To reheat, place slices of prime rib in a shallow pan and add about 1/4 cup of beef stock. Cover with foil and heat in a 300 degree oven for 10-15 minutes or until heated through.

Freezer ~ Completely cool the prime rib. Tightly wrap in plastic wrap and then in a resealable freezer bag. Store in the freezer for up to 2 months. To reheat, thaw the meat in the refrigerator. Place thawed slices of prime rib in a shallow pan and add about 1/4 cup of beef stock. Cover with foil and heat in a 300 degree oven for 10-15 minutes.

what to serve with prime rib

more dinner recipe ideas

If you make my bone-in prime rib recipe, be sure to give it a rating and/or comment below. Take a phot and tag @amycaseycooks on Instagram. Thank you!

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