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Keto Dinner

Cajun Prime Rib Roast

This Keto Cajun Prime Rib Roast brings the bold flavors of Louisiana to your table without the carbs. I've found that a spicy rub and high-heat start create a succulent, crust enriches the tender beef. Perfect for holiday feasts or special family dinners, it's a low-carb showstopper that satisfies your cravings while keeping you in ketosis.

15 min Prep time 140 min Cook time 155 min Total time 4 Servings 820 Calories
Cajun Prime Rib Roast

Ingredients

  • (4 pound) boneless prime rib
  • tablespoons hot pepper sauce
  • teaspoons garlic powder
  • tablespoons Cajun seasoning blend (such as Tony Chachere's®)
  • (16 ounce) package sliced mushrooms

Instructions

  1. Step 1

    Start by preheating your oven to 500°F. Pat the prime rib dry, then rub it generously with hot pepper sauce—I like to use a brush for even coverage. Sprinkle garlic powder and Cajun seasoning all over, pressing gently to adhere. Place the roast in a pan and pop it into the hot oven for 20 minutes to sear the exterior. Then, lower the heat to 350°F and roast until the internal temperature hits 145°F for medium, about 2 hours. I always rely on a meat thermometer for accuracy. Once done, tent it with foil and let it rest for 30 minutes—this step keeps the juices in. While it rests, pour the pan drippings into a skillet over medium heat. Add sliced mushrooms and sauté until tender and fragrant. Slice the roast against the grain and serve with the mushrooms on the side.

Chef's Tip

My secret is to take the prime rib out of the fridge 1 hour before roasting so it cooks evenly. Also, a sprinkle of smoked paprika in the Cajun mix adds a deeper smoky note that pairs beautifully with the beef.

Storage Tips

Store leftover slices in an airtight container in the fridge for up to 4 days. For best results, reheat gently in a 300°F oven wrapped in foil with a splash of broth or butter to maintain juiciness.

Variation Tips

Serve with a side of buttery cauliflower mash and roasted asparagus for a complete keto dinner. For a milder flavor, replace the Cajun seasoning with equal parts garlic powder, rosemary, and thyme. You can also add a dollop of horseradish cream (made with sour cream and prepared horseradish) for a classic touch.

Frequently Asked Questions