1/4 cup soy sauce
1 green onion, coarsely chopped
1/2 lemon, sliced
1 slice gingerroot, 1-inch long, halved
4 (6-ounce) firm fish fillets
Combine soy sauce, onion, lemon, ginger, and fish fillets in a resealable plastic bag. Marinate in the refrigerator for 30 minutes, turning periodically.
Meanwhile prepare hot coals in the grill (or preheat gas grill). Spray grill rack with nonstick cooking spray. Heat a well-greased grill to medium-high heat.
Remove fillets from bag, discarding marinade, and place on the grill. Cook about 4 to 5 minutes per side, turning once, or until fish is firm and flaky