1Heat gas or charcoal grill. In 10-inch skillet, heat oil over medium heat. Add bell peppers and garlic; stir to coat. Cover; simmer 15 minutes.
2Meanwhile, in small bowl, mix fennel seed, mustard, salt, garlic powder and pepper. Sprinkle mixture on both sides of swordfish. Remove pepper mixture from heat; season to taste with additional salt and pepper. Cover to keep warm.
3Carefully brush oil on grill rack. Place swordfish on grill over medium heat. Cover grill; cook 10 to 12 minutes, turning once, until fish flakes easily with fork. Serve fish with pepper mixture.