Slow-Roasted Bone-In Prime Rib

There are few dishes that embody celebration quite like a beautifully roasted Slow-Roasted Bone-In Prime Rib. This recipe is all about simplicity and technique, allowing the rich flavour of the meat to shine through. The result? A show-stopping centerpiece with a perfectly cooked, juicy, melt-in-your-mouth interior and a crispy, golden crust.

This 4-bone prime rib roast is slowly cooked to perfection, infused with aromatics, and finished with a blow torch (or your broiler) for that irresistible, crispy fat cap. Perfect for hosting a holiday feast, a special family dinner or celebrating National Prime Rib Day

Ingredients

• Bone-in prime rib roast (When you are buying a roast, plan on 1 pound of bone-in roast per guest)
• Kosher salt
• Vegetable oil
• White onions
• Celery
• Carrots
• Fresh rosemary

See recipe card below for quantities.

Instructions

Prepare the Roast

Score the Fat: Using a sharp knife, lightly score the fat cap of the prime rib in a
crisscross pattern. This helps render the fat and develop a crispy crust.

Season Well: Generously season the entire roast with kosher salt, making sure to get into all the nooks and crannies. Let the roast sit at room temperature for 1 hour to allow the salt to penetrate the meat.

Sear the Fat Cap

Preheat a large roasting pan or roaster over high heat. Add the vegetable oil and allow it to shimmer.

Place the roast fat side down in the roaster and sear for about 7-10 minutes until the fat is golden brown. Remove the roast and set it aside.

Prepare the Roasting Pan

Add the chopped onions, celery, carrots, and a few sprigs of rosemary directly into the roasting pan. These aromatics will infuse the meat with flavour as it cooks and also make a fantastic base for a pan sauce or gravy if desired.

Place a roasting rack on top of the vegetables.

Slow Roast the Prime Rib

Preheat your oven to 275°F (135°C).

Place the prime rib on the roasting rack, fat cap facing up. Tuck a few sprigs of rosemary under the butcher's twine for extra aroma.

Roast for approximately 4-5 hours for a 4-bone roast (or 3-4 hours for a 3-bone roast) or until the internal temperature of the thickest part of the meat reaches 122°F (50°C) for medium-rare. (Adjust the cooking time and internal temperature slightly if you prefer your roast more or less done. See Prime Rib Temperature Chart.)

Finish with a Blow Torch & Rest

Once the roast reaches the desired internal temperature, remove the roast from the oven and use a blow torch to crisp up the fat cap to golden-brown perfection. If you don't have a torch you can use the broiler (see tips below).

Tent loosely with foil and set aside. Let the roast rest for 45 minutes; during this time, the internal temperature will rise to about 128°F-130°F (slightly higher if broiled) for a lovely medium-rare finish.

Slice & Serve

When ready to serve, slice off the bones. Do not discard the bones, gnawing on the bones is my favourite part! I would suggest slicing ½-inch slices for most people, my boys prefer 1-inch slices!

Best Sides for Prime Rib

• Homemade Beef Broth Gravy
• Quick Horseradish Cream Sauce
• Roasted Garlic-Sour Cream & Chive Mashed Potatoes
• Roasted brussels sprouts, potatoes, or your favourite vegetables.
• Soft dinner rolls

Watch how this Slow-Roasted Prime Rib recipe was made here.

Chef's Tips:

Recommended Doneness

Medium-Rare is the most recommended doneness for prime rib, as it ensures a juicy, tender texture.

For guests who prefer more well-done slices, cut the portion they want and briefly sear the slices in a hot skillet for 1-2 minutes on each side, or place them under a broiler for a minute or two. This allows you to quickly bring those slices up to medium, medium-well, or well-done without overcooking the entire roast.

Room Temperature Rest

Allowing the roast to sit at room temperature before cooking helps it cook more evenly throughout.

Slow & Low Cooking

Cooking at a low temperature ensures even doneness and a tender, juicy result.

Crisping without a Blow Torch

If you do not have a blow torch, you can turn on your oven's broiler to crisp up the fat cap. With your oven empty and a rack placed in the lower third of the oven. Preheat the broiler on high for 10-15 minutes. Slide in the roaster and leave the door slightly ajar and watch carefully, rotating the roasting pan as required to get an even browning. Cook for 3-4 minutes, you don't want to cook the meat, just brown the fat.

Storing & Reheating

Storage: Wrap leftovers tightly in foil or place in an airtight container and refrigerate for up to 4 days.

Reheating: To maintain its tenderness, reheat slices in a 275°F oven covered with foil until warmed through, or use a hot skillet for a quick sear.

Leave a Comment

If you get the chance to try this Slow-Roasted Bone-In Prime Rib recipe please drop back and leave us a comment and rating here. We would love to know what you think! Thanks Elaine & James

📖 Recipe

Slow-Roasted Bone-In Prime Rib

There are few dishes that embody celebration quite like a beautifully roasted prime rib. This recipe is all about simplicity and technique, allowing the rich flavour of the meat to shine through.

The result? A show-stopping centerpiece with a perfectly cooked, juicy, melt-in-your-mouth interior and a crispy, golden crust.This 4-bone prime rib roast is slowly cooked to perfection, infused with aromatics, and finished with a blow torch (or your broiler) for that irresistible, crispy fat cap. Perfect for hosting a holiday feast, a special family dinner or celebrating National Prime Rib Day!

5 from 5 votes

Print Recipe Pin Recipe

Prep Time 30 minutes mins

Cook Time 5 hours hrs

Resting Time 45 minutes mins

Total Time 6 hours hrs 15 minutes mins

Course Dinner, Entree, Main Course

Cuisine International

Servings 12 -16 People

Cook ModePrevent your screen from going dark

Ingredients

  

1x2x3x

• 1 bone-in prime rib roast ours was a 4-bone, 14lbs roast. When you are buying a roast, plan on 1 pound of bone-in roast per guest.
• Kosher salt generously for seasoning
• 3 tablespoons vegetable oil
• 2 large white onions roughly chopped
• 2 ribs of celery roughly chopped
• 2 large carrots roughly chopped
• 4-6 sprigs fresh rosemary plus extra for garnish

Instructions

 

Prepare the Roast

• Score the Fat: Using a sharp knife, lightly score the fat cap of the prime rib in a crisscross pattern. This helps render the fat and develop a crispy crust.
• Season Well: Generously season the entire roast with kosher salt, making sure to get into all the nooks and crannies. Let the roast sit at room temperature for 1 hour to allow the salt to penetrate the meat.

Sear the Fat Cap

• Preheat a large roasting pan or roaster over high heat. Add the vegetable oil and allow it to shimmer.
• Place the roast fat side down in the roaster and sear for about 7-10 minutes until the fat is golden brown. Remove the roast and set it aside.

Prepare the Roasting Pan

• Add the chopped onions, celery, carrots, and a few sprigs of rosemary directly into the roasting pan. These aromatics will infuse the meat with flavour as it cooks and also make a fantastic base for a pan sauce or gravy if desired.
• Place a roasting rack on top of the vegetables.

Slow Roast the Prime Rib

• Preheat your oven to 275°F (135°C).
• Place the prime rib on the roasting rack, fat cap facing up. Tuck a few sprigs of rosemary under the butcher's twine for extra aroma.
• Roast for approximately 4-5 hours for a 4-bone roast or 3-4 hours for a 3-bone roast, or until the internal temperature of the thickest part of the meat reaches 122°F (50°C) for medium-rare. (Adjust the cooking time and internal temperature slightly if you prefer your roast more or less done. See Prime Rib Temperature Chart.)

Finish with a Blow Torch & Rest

• Once the roast reaches the desired internal temperature, remove the roast from the oven and use a blow torch to crisp up the fat cap to golden-brown perfection. If you don't have a torch you can use the broiler (see tips below).
• Tent loosely with foil and set aside. Let the roast rest for 45 minutes; during this time, the internal temperature will rise to about 128°F-130°F (slightly higher if broiled) for a lovely medium-rare finish.

Slice & Serve

• When ready to serve, slice off the bones. Do not discard the bones, gnawing on the bones is my favourite part! I would suggest slicing ½-inch slices for most people, my boys prefer 1-inch slices.
• Suggested Sides: Homemade Beef Broth Gravy, Quick Horseradish Cream Sauce, Roasted Garlic-Sour Cream & Chive Mashed Potatoes, Roasted brussels sprouts, potatoes, or your favourite vegetables and soft dinner rolls

Rate this Recipe

• If you make this, please leave a rating and review letting us know how it was! Each review helps so much! Thank you!

Video

Notes

Chef's Tips:

• Medium-Rare: is the most recommended doneness for prime rib, as it ensures a juicy, tender texture. See Prime Rib Temperature Chart.
• For guests who prefer more well-done slices, cut the portion they want and briefly sear the slices in a hot skillet for 1-2 minutes on each side, or place them under a broiler for a minute or two. This allows you to quickly bring those slices up to medium, medium-well, or well-done without overcooking the entire roast.
• Timing: A 3-bone could take 3-4 hours and a 4 bone will take approximately 5 hours.
• Room Temperature Rest: Allowing the roast to sit at room temperature before cooking helps it cook more evenly throughout.
• Slow & Low Cooking: Cooking at a low temperature ensures even doneness and a tender, juicy result.
• Crisping without a Blow Torch: If you do not have a blow torch, you can turn on your oven's broiler to crisp up the fat cap. With your oven empty and a rack placed in the lower third of the oven. Preheat the broiler on high for 10-15 minutes. Slide in the roaster and leave the door slightly ajar and watch carefully, rotating the roasting pan as required to get an even browning. Cook for 3-4 minutes, you don't want to cook the meat, just brown the fat.

Storing & Reheating

• Storage: Wrap leftovers tightly in foil or place in an airtight container and refrigerate for up to 4 days.
• Reheating: To maintain its tenderness, reheat slices in a 275°F oven covered with foil until warmed through, or use a hot skillet for a quick sear.
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