Cajun-Style Prime Rib
This prime rib is one of my go-to recipes. I love the bold Cajun flavors here, but the technique is the real takeaway—once you know how to cook prime rib well, you can change the seasoning to suit your taste. The instructions below focus on a reverse-sear method that produces an even medium-rare from edge to edge with a dark, flavorful crust.
What’s the Best Way To Cook a Prime Rib Roast?
There are several effective methods—smoking, grilling, or oven-roasting. I prefer the reverse-sear approach: cook low and slow until the interior is nearly at temperature, then finish with high heat to create a crust. This gives a consistent medium-rare and preserves the delicate rib cap, which cooks faster than the rest of the roast.
What Temperature Do I Cook Prime Rib At?
Many guides recommend searing at very high heat first, then lowering the temperature. That works if you want medium or well-done slices, but it often overcooks the outside. For a uniform medium-rare, start low and finish hot. I recommend an initial cook at 225°F until the roast reaches 110°F internal, then finish with a blast of very high indirect heat (around 700°F on a grill). In an oven, use the broiler to replicate the high-heat finish—preheat the broiler, then turn it off before placing the roast under it so you get intense radiant heat without immediate burning.
If guests prefer more well-done slices, simply return individual slices to direct heat for a minute per side to warm them through without drying the whole roast.
Is a Rib Roast the Same Thing?
Yes. The terms prime rib, rib roast, and standing rib roast refer to meat from the same section of the steer. Prime rib can be sold bone-in or boneless; a rib roast usually implies bone-in. The cut and flavor are essentially the same.
Cooking Tips
The Temp: Keep the grill or oven steady and low during the initial stage, and pull the roast at 110°F internal. Use a reliable leave-in meat thermometer to track temperatures.
The Smoke: Oak smoke pairs nicely with Cajun seasoning, but skip wood if you prefer a cleaner beef flavor.
The Position: Place the roast with the bone side toward the heat source. The bones insulate the meat and keep the rib cap farther from direct heat, helping it stay tender.
The Tie: Use butcher’s twine to truss the roast into a uniform cylinder. That shape cooks more evenly than the natural oval shape.
The Rest: With the reverse-sear method, the roast rests while you heat the coals for the final sear, so you can slice and serve almost immediately after the high-heat finish.
Cajun-Style Prime Rib Recipe
Serves: 4 | Prep Time: 20 minutes | Cook time: about 2 hours
Ingredients
1 4-pound bone-in prime rib roast
1 tbsp olive oil
Cajun Rub:
2 tbsp smoked paprika
2 tbsp kosher salt
2 tbsp garlic powder
1 tbsp onion powder
1 tbsp cayenne powder
1 tbsp red pepper flakes
1 tbsp fine ground black pepper
1 tbsp white pepper
1 tbsp dried parsley
1 ½ tbsp oregano
2 tsp hot paprika
How To Cook a Prime Rib Roast on a Grill
Step 1: Combine the Cajun rub ingredients in a shaker or bowl and mix well. Remove the roast from the refrigerator to let it come up slightly toward room temperature while you prepare the grill.
Step 2: Set up your grill for two-zone cooking and stabilize it at 225°F for the low-and-slow phase.
Step 3: Truss the roast with butcher’s twine so it forms a consistent cylinder. Rub the roast evenly with olive oil, then coat it liberally with the Cajun rub.
Step 4: Add oak wood chunks to the coals if you want smoke. Insert a meat thermometer probe into the thickest part of the roast. Place the roast on the grill over indirect heat, bones toward the heat source, and cook until the internal temperature reaches 110°F—this typically takes about two hours at 225°F.
Step 5: Remove the roast and stoke the coals or add extra hot coals to raise the grill temperature for a high-heat finish (aim for very hot—on a charcoal grill this can reach about 700°F). Allow the coals to settle and the grill to get hot; the roast will continue to climb a few degrees while resting.
Step 6: Return the roast over indirect heat for 7–10 minutes to develop a dark, charred crust. Watch it closely so the exterior doesn’t burn.
Step 7: Remove the roast, slice, and serve. Classic pairings include garlic mashed potatoes and a horseradish cream sauce.
How to Cook Prime Rib
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Ingredients
- 1 4-pound bone-in prime rib roast
- 1 tbsp olive oil
Cajun Rub:
- 2 tbsp smoked paprika
- 2 tbsp kosher salt
- 2 tbsp garlic powder
- 1 tbsp onion powder
- 1 tbsp cayenne powder
- 1 tbsp red pepper flakes
- 1 tbsp fine ground black pepper
- 1 tbsp white pepper
- 1 tbsp dried parsley
- 1 ½ tbsp oregano
- 2 tsp hot paprika
Instructions
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Combine all Cajun rub ingredients and mix thoroughly. Remove the roast from the refrigerator to take the chill off while you prepare the grill.
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Set your grill for two-zone cooking and stabilize at 225°F for the low-and-slow stage.
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Truss the roast with butcher’s twine, coat evenly with olive oil, then apply the Cajun rub all over.
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Optional: add oak wood chunks to the coals. Insert a meat thermometer into the thickest part of the roast and place it on the grill over indirect heat with the bones facing the heat. Cook until the internal temperature reaches 110°F (about two hours).
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Remove the roast and stoke the coals to raise the grill temperature for the final sear. This may take 10–15 minutes; the roast will rest and continue to rise slightly while you prepare the high heat.
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Return the roast to the grill over indirect heat and expose it to very high heat for 7–10 minutes to develop a rich, dark crust.
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Remove the roast, slice, and serve alongside your favorite sides such as garlic mashed potatoes and horseradish cream sauce.