Roasted Keto Reverse Sear Prime Rib – Perfect!

Keto Reverse Sear



Prime rib

  • 1 (8-pound) boneless prime rib roast
  • 2½ tablespoons fine sea salt
  • 1½ tablespoons ground black pepper
  • ½ cup softened ghee or unsalted butter
  • 2 tablespoons chopped fresh rosemary
  • 2 tablespoons chopped fresh thyme

Tiger sauce

  • 1 cup sour cream
  • ¼ cup prepared horseradish
  • 2 tablespoons chopped fresh dill or 2 teaspoons dried dill
  • Fine sea salt (optional)


  • Season the roast liberally with salt and pepper.
  • Cover the roast with plastic wrap and place it in the refrigerator for at least 8 hours or overnight.
  • Two hours before baking, remove the roast from the fridge and allow it to come to room temperature.
  • Preheat the oven to 150°F (or the lowest available temperature for your oven).
  • Place the roast in a large roasting pan.
  • Rub the softened ghee all over the roast, then sprinkle it with the chopped herbs.
  • Bake the roast for 5½ hours (or 3½ hours in a 200°F oven), or until the internal temperature reaches 115°F for medium-rare or 135°F for medium.
  • The internal temperature will keep rising as the meat rests.
  • While the roast is cooking, make the tiger sauce: Place the sour cream, horseradish, and dill in a small bowl and stir well to combine.
  • Taste and adjust the seasoning, adding more dill or a pinch of salt, if desired.
  • Cover and store in an airtight container in the refrigerator until ready to serve.
  • About 10 minutes before serving, increase the oven temperature to 500°F.
  • Once the temperature is at 500°F, let the roast sear in the oven for 8 minutes or until brown and crispy on the outside.
  • Remove the roast from the oven, allow it to rest for 10 minutes, and then carve it into ¾-inch-thick slices.
  • Serve with the tiger sauce and the pan juices.


  • You can also use the pan drippings to make Yorkshire Pudding, a classic accompaniment to prime rib!



  • Store extra meat and sauce in separate airtight containers for up to 3 days.
  • Reheat the roast on a rimmed baking sheet in a preheated 350°F oven for 5 minutes or until warmed through.


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