Barbecued Pork Sandwiches with Pickled Red Onion
['1 red onion, halved, thinly sliced', '1 1/2 cups boiling water', '1 cup plus 2 tablespoons orange juice', '6 tablespoons distilled white vinegar', '1/2 teaspoon (scant) salt', '1 garlic clove, peeled', '1/2 teaspoon smoked salt or coarse kosher salt', '3 tablespoons purchased tomato-based barbecue sauce', '2 tablespoons orange juice', '2 tablespoons fresh lime juice', '1/2 cup olive oil', '1 tablespoon coarsely ground black pepper', '1 tablespoon smoked Spanish paprika (Pimentón de La Vera)*', '1 teaspoon smoked salt or coarse kosher salt', '2 (1-pound) pork tenderloins', 'Nonstick vegetable oil spray', '6 large onion rolls, split, toasted', '*Available at some supermarkets and specialty foods stores', 'and from tienda.com.']
Place sliced onion in medium bowl. Pour boiling water over. Let stand 10 minutes; drain well, then return to bowl. Add juice, vinegar, and salt and stir to blend. Cover and chill at least 2 hours and up to 1 day.
Chop garlic with salt to paste; scrape into small bowl. Add barbecue sauce, orange juice, and lime juice to bowl. Gradually whisk in oil. Season vinaigrette to taste with pepper. DO AHEAD Can be made 1 day ahead. Cover and refrigerate.
Blend pepper, smoked paprika, and salt in small bowl. Sprinkle seasoning mix evenly over both tenderloins. Let stand at least 30 minutes and up to 2 hours.
Spray grill rack with nonstick spray. Prepare barbecue (high heat). Grill tenderloins uncovered 5 minutes, rolling over to sear all sides. Cover grill and continue to cook until thermometer inserted into thickest part registers 145°F, turning often and moving to cooler part of grill as needed, about 15 minutes longer. Transfer to cutting board; let rest 10 minutes.
Thinly slice tenderloins crosswise into rounds. Mound pork on roll bottoms. Top with well-drained onion slices, then drizzle with vinaigrette. Cover with roll tops and serve, passing extra onion slices and vinaigrette separately.
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