Step 1: Combine the ingredients for the rub in a bowl and stir or whisk to mix. You’ll need about 3 tablespoons for this recipe. Transfer the remaining rub to a jar and store, covered, away from heat and light. The rub will keep for several months.
Step 2: Sprinkle the tuna steaks generously on both sides with the rub. Cover and marinate in the refrigerator for 30 minutes, if desired.
Step 3: Set up a grill for direct grilling and preheat to high. If using a plancha or cast iron skillet, place it on the grill grate and preheat at the same time. Brush and oil the cooking surface. Just before grilling, add the wood chips to the coals or place in your grill’s smoker box.
Step 4: Brush each tuna steak on one side with melted butter.
Step 5: Place the tuna steaks on the plancha or grill grate, butter side down. Sear for 2 minutes, then turn; brush melted butter on the other side of each steak. Grill for 2 more minutes, or until darkly seared on the outside, but still rare in the center, turning with tongs.
Step 6: Transfer the tuna steaks to a cutting board. Cut into 1/4 inch slices and fan these out on a platter or plates. Sprinkle with sliced scallions and serve with the Cajun Remoulade.
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Steven Raichlen’s Project Smoke is a production of Maryland Public Television, Barbacoa, Inc., and Resolution Pictures. © 2017 Barbacoa, Inc.