Cedar-Planked Salmon With Mustard Dill Sauce

⏲ ~31 min total · prep 15 · cook 16 · 4 servings

Lunch⏱ 135 min total🔥 2.8g net carbs

By the KFI Test Kitchen · Tested & approved by Jason Lieu, KFI recipe editor

Published Sep 15, 2026 · Updated Sep 15, 2026

Cedar-Planked Salmon With Mustard Dill Sauce

Ingredients

Instructions

  1. Submerge the cedar plank in water and weight it with a can so it stays under; soak 2 hours. A dry plank flames up, a soaked one only smokes.
  2. Whisk the Dijon, stone-ground mustard, allulose, lemon juice, and 1 tablespoon of the dill in a small bowl, then whisk in the olive oil a little at a time until the sauce is creamy and holds its shape.
  3. Blot the salmon dry, rub lightly with oil, and season the flesh with the salt and pepper. Lay the fillets skin-side down on the plank, edges just touching.
  4. Set up the grill for indirect heat at 400°F (burners lit on one side only) and place the plank on the unlit side. Close the lid and roast 15-18 minutes, until the salmon is pale at the edges and reads 125-130°F in the thickest part, with thin ribbons of smoke curling off the wood.
  5. Scatter the remaining dill over the hot salmon, carry the plank straight to the table, and pass the mustard-dill sauce and lemon slices alongside.

Why this recipe works

Tips for making this recipe well

Weight the plank down

Cedar floats, and any section that edges out of the water dries and defeats the soak. Weight it with a can for the full 2 hours. A dry plank flames up; a soaked one only smokes, as the recipe puts it.

Edges just touching

Lay the fillets skin-side down with their edges barely meeting on the plank. They support each other and cook at the same rate. Crowded any tighter and the middle fillet lags by several minutes.

Whisk the oil in slowly

Olive oil goes in a little at a time with the whisk moving, or the sauce splits into a greasy puddle. Done right, it turns creamy and holds its shape on a spoon. If it breaks anyway, whisk a teaspoon of mustard in a clean bowl and stream the broken sauce into it.

Read the thickest fillet

Pull the plank at 125-130°F in the thickest part. The fish carries over a few degrees as you carry it to the table, and the flesh keeps setting while it sits. Past 140°F salmon squeezes out its moisture and turns dry.

Dill at the end

The remaining dill scatters over the hot fish off the grill, so it wilts slightly and stays green. Added earlier it would blacken under the lid. Carry the plank out on a sheet pan or trivet.

Serving suggestions

Set the plank on a trivet in the middle of the table and let it be the centerpiece. Pass the mustard-dill sauce in a small bowl with the lemon slices beside it, and make extra sauce if you can, because people use more than you expect. Asparagus or a cucumber salad sits alongside without competing, and at 2.8 net carbs a serving the plate has room to be generous. Scrape the skin off the wood afterward; it lifts away in sheets once the fish is gone.

Storage and meal prep

Pick the flesh off the plank once everything cools and refrigerate it in a shallow container for 3 to 4 days. The sauce keeps separately for the same stretch and firms in the fridge; set it out for 20 minutes and whisk it back to life. Leftover salmon is good cold over greens or gently warmed in a low oven. Cooked salmon freezes for 2 to 3 months, though the texture turns slightly flaky-dry after thawing. The plank itself is spent after one roast; let it cool completely and discard it.

Variations worth trying

Frequently asked questions

Is a 2-hour soak really necessary?

Yes. Two hours saturates the wood enough that it smokes slowly for the entire roast instead of catching fire. A 15-minute soak gives you a plank that edges toward flame before the fish is done. Weight it with a can so it stays under.

What kind of plank should I buy?

Untreated cooking-grade cedar, about 14x7 inches for this recipe. Avoid sanded or finished planks and anything sold as decorative. Kitchen supply stores and supermarket grilling aisles carry planks labeled for cooking.

Why indirect heat instead of direct?

The plank sits over the unlit side so the wood smolders rather than burns while the fillets roast gently for 15-18 minutes. A plank over live flame is how grill fires start. The closed lid keeps the smoke circulating around the fish.

Can the sauce be made ahead?

Yes, up to a day ahead. It firms in the refrigerator, so set it out for 20 minutes and whisk vigorously before serving. The allulose keeps it from turning thick and syrupy the way a sugared dressing would.

How do I know the salmon is done?

The flesh turns pale at the edges and reads 125-130°F in the thickest part, with thin ribbons of smoke curling off the wood. Flakes at the corner of one fillet should separate in thick, moist sections. The walk to the table finishes the center.

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