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Dijon-rubbed prime rib cooked medium rare and sliced on a marble cutting board. Cast iron skillet with cheddar crumb mashed potatoes, glass of red wine and plates in background.
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Dijon-Rubbed Prime Rib With Cheddar Crumb Mashed Potatoes

The prime rib roasts beautifully with a savory Dijon crust that locks in flavor, while the mashed potatoes get a cheesy, golden topping that's impossible to resist.
Prep Time15 mins
Cook Time2 hrs
Thawing Time2 d
Total Time2 d 2 hrs 15 mins
Course: Main Course
Cuisine: American
Keyword: Dijon Prime Rib
Servings: 8 servings
Author: Chef David Rose

Ingredients

Dijon Rub

  • 2 tablespoons whole-grain mustard
  • 1 tablespoon Worcestershire sauce
  • 1 tablespoon olive oil

Crispy Crumb

  • 30 oz. buttery round crackers, finely blended
  • 3 tablespoons unsalted butter
  • 1/2 teaspoon black pepper

Prime Rib

Cheesy Mashed Potatoes

Instructions

Dijon Rub

  • Place all ingredients in a small bowl and whisk until fully incorporated.

Crispy Crumb

  • Place all ingredients in a medium bowl and stir until well combined.

Prime Rib

  • Thaw prime rib in the refrigerator for 48 hours until completely thawed.
  • In a small bowl, mix the kosher salt and cumin.
  • Remove the prime rib from the refrigerator, pat dry on all sides with paper towels, and season generously with dry seasoning mix. Let it come to room temperature for about 1 hour.
  • Preheat oven to 250 degrees Fahrenheit.
  • Add grapeseed oil to a large cast-iron pan and bring to medium-high heat.
  • In the cast-iron pan, sear the roast on all sides until golden brown, about 2 minutes per side.
  • Transfer the seared roast to a large wire rack-lined sheet pan. Brush the Dijon rub all over the roast.
  • Cook the prime rib roast until internal temperature is 10 degrees below desired cooking doneness, about 1 hour 15 minutes to 1 hour 30 minutes for medium-rare doneness. Refer to the Omaha Steaks roast cooking chart for other levels of doneness.
  • Preheat oven to 400 degrees Fahrenheit for the potatoes and let the roast rest for 15 to 20 minutes before slicing.

Cheesy Mashed Potatoes

  • Do not thaw mashed potatoes. Remove the plastic wrap and microwave on high for 3 to 4 minutes.
  • Stir and cook for an additional minute.
  • Remove from the microwave and transfer potatoes into a medium cast-iron pan.
  • Stir in the cheddar cheese until fully incorporated. Top evenly with crispy crumb.
  • Bake for 15 minutes in the oven until the top is golden brown and bubbly and serve hot.