Plank-Roasted Tilapia

Fish
  • 1 untreated (about 12x10x1-inch) red cedar plank

  • 3 tablespoons olive oil, divided

  • 2 plum tomatoes, halved lengthwise

  • 1 small sweet onion, quartered

  • 1 large red bell pepper, halved lengthwise

  • ½ cup Kalamata olives, pitted, coarsely chopped

  • 3 anchovy fillets, finely chopped

  • 2 garlic cloves, chopped

  • 2 tablespoons chopped fresh basil

  • 1 tablespoon drained capers

  • 1 tablespoon white balsamic vinegar

  • 4 6-ounce tilapia fillets

  • 8 long thin slices prosciutto

Fill roasting pan with water. Add cedar plank; weigh down with can or small pot to keep submerged and soak 1 day.
Prepare barbecue (high heat). Brush grill rack with 1 tablespoon oil. Arrange tomatoes, onion, and bell pepper on rimmed baking sheet. Sprinkle with salt and pepper; drizzle with 1 tablespoon oil. Grill vegetables until lightly charred and blistered, turning occasionally with tongs, about 4 minutes for tomatoes and 8 minutes for onion and pepper. Return vegetables to same sheet and cool slightly.
Peel tomato halves; peel pepper halves. Chop all vegetables coarsely and place in medium bowl. Add olives, anchovies, garlic, basil, capers, vinegar, and remaining 1 tablespoon oil. Toss to blend. Season relish to taste with salt and pepper. (Can be made 1 hour ahead. Let stand at room temperature.)
Sprinkle fillets with salt and pepper. Wrap 2 prosciutto slices around each fillet, leaving top and bottom exposed. Secure prosciutto with toothpicks. Press each fillet slightly to flatten top.
Drain cedar plank. Place fillets on plank. Spoon ¼ cup relish atop each fillet and press to adhere. Place plank on grill; cover barbecue. Cook fish until just opaque in center and thermometer inserted into center registers 120°F, checking occasionally and spraying plank with water if beginning to burn, about 18 minutes. Transfer fish to plates. Serve, passing remaining relish.
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