Preheat oven to 400°F. Press each fillet into coriander seeds to coat all sides. Sprinkle
with pepper. Heat 1/2 tablespoon oil in large skillet over high heat. Add 3 fillets and sear until brown, about 1 minute per side. Transfer to large rimmed baking sheet. Repeat with remaining 3 fillets and 1/2 tablespoon oil. Spoon 1 tablespoon sauce over each fillet. Bake until just cooked through, about 5 minutes for medium-rare. Transfer fish to plates.