Prime Rib with Horseradish Whipped Cream

Recipe Note

Recipe FAQ

Why cook at 375°F instead of the lower temperatures often used for prime rib?

Many prime rib recipes use 225–250°F for a slow, even cook. At 375°F indirect on the YS640s, the exterior develops more bark and the pellet smoke penetrates more assertively during the cook — the result is a roast with a defined, seasoned crust rather than the pale exterior of a pure low-and-slow cook. The 3-hour window at 375°F also means less time in the temperature danger zone and a more manageable cook time for a large gathering. The tradeoff is slightly less uniform edge-to-edge doneness compared to a 225°F reverse-sear approach, but the bark and smoke character are meaningfully better.

What internal temperature should I actually pull it at for medium-rare?

Pull at 120–125°F. A 6 lb boneless prime rib roast will carry over 10–15°F during the 20-minute rest, landing at 130–135°F — the classic medium-rare range where the interior is pink and the fat has fully rendered. Pulling at 130°F produces a finished roast at 140–145°F (medium), which is noticeably less juicy and less buttery in texture. Use an instant-read thermometer and insert it at the thickest point, not near a fat cap or the exterior edge.

Can I make the Horseradish Whipped Cream ahead of time?

Yes — make it up to 4 hours ahead and refrigerate covered. The whipped cream will hold its structure for a few hours but will begin to lose volume and weep liquid if held overnight. If made ahead, whisk gently before serving to re-incorporate any separated liquid. Don't add the Dijon, horseradish, W Sauce, and black pepper salt until just before serving if making very far in advance — the acid in the Dijon can break down the whipped cream structure over time.

How much Trail Dust should I use on a 6 lb roast?

The recipe calls for Trail Dust "to season" without a specific quantity — for a 6 lb boneless prime rib, 3–4 tablespoons applied evenly across all surfaces is a reasonable starting point. Trail Dust is a balanced all-purpose seasoning; it won't over-season at that quantity on a roast this size. Apply it generously enough to see visible coverage on all sides after the W Sauce binder is on.

Can I make this indoors?

Indoor cooking rating: 4 out of 5 — Great in the kitchen, better on the grill. A conventional oven at 375°F roasts the prime rib identically — same temperature, same second-shelf position on a roasting rack, same 120–125°F pull target, same 20-minute rest. The Horseradish Whipped Cream is entirely countertop. What you lose is the pellet smoke character from the YS640s, which adds a faint smoky depth to the exterior crust. The indoor version is still a spectacular roast.

Recipe Highlights

• Apply W Sauce First, Trail Dust Second — Not Mixed Together: The W Sauce goes on as a thin slather (binder layer) before the Trail Dust — not mixed together in a bowl. Applying the W Sauce first creates a wet, tacky surface; the Trail Dust is then applied directly onto that surface, where it adheres into the binder rather than falling off. Mixing them together produces a paste that applies unevenly and doesn't create the same dry rub crust on the exterior.

   

• Second Shelf Position Keeps the Fat Cap from Scorching: Direction step 3 places the roast on the second shelf of the YS640s, away from the firebox heat. A 6 lb prime rib has a significant fat cap — at 375°F with direct firebox heat, that fat cap would render and char before the interior reaches temperature. On the second shelf, the heat is indirect and even, the fat cap renders slowly and forms a crust without scorching, and the smoke circulates around the entire roast uniformly.

   

• Whip the Cream to Soft Peaks, Then Fold — Don't Over-Blend: Direction step 4 whips the heavy cream first, then folds in the remaining ingredients. Over-whipped cream loses its light texture and becomes grainy; under-whipped cream won't hold the other ingredients in suspension. Soft peaks — where the cream holds its shape but the tips fall over — is the correct target. Fold in the sour cream, horseradish, Dijon, W Sauce, and black pepper salt with a spatula, not the blender, to preserve the whipped texture.

   

• Rest on the Cutting Board, Not Back in the Grill: The 20-minute rest happens on the cutting board or a sheet pan tented loosely with foil — not in the grill or oven. Resting in residual heat continues the internal temperature rise beyond the carry-over window and can push the roast past medium-rare. On the cutting board at room temperature, carry-over brings it precisely to 130–135°F and stops there. Tent with foil but don't seal it — sealed foil traps steam and softens the crust.

   

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