A quick soak in the lime and cilantro marinade is all that's needed to flavor swordfish steaks. Marinate the fish for only 1 hour or the fish may become tough.
Thaw fish, if frozen. For marinade, combine lime peel, lime juice, oil, garlic, cilantro, pepper, and salt. Place fish in a plastic bag set into a shallow dish. Pour marinade over fish in bag. Seal bag; turn to coat well. Refrigerate 1 hour, turning bag occasionally.
Remove fish from marinade; discard marinade. Place fish on greased grill rack directly over medium coals. Grill 6 to 8 minutes or until fish flakes when tested with a fork, turning once halfway through grilling time.
Or, preheat gas grill. Adjust heat for direct cooking. Place fish on greased grill rack over medium heat. Grill uncovered as directed in step 2. Makes 6 servings.