Grilled Lemon-Soy Salmon

3 tablespoons dry white wine
3 tablespoons fresh lemon juice
1 1/2 tablespoons low-sodium soy sauce
1/2 teaspoon salt
1 1/2 teaspoons olive oil
1 garlic clove, minced
4 (6-ounce) salmon fillets (about 1 inch thick)
Cooking spray
Sliced green onions (optional)

Combine the first 6 ingredients in a large zip-top plastic bag. Add salmon to bag; seal. Marinate in refrigerator 40 minutes, turning once.
Prepare grill.
Remove fish from bag, and reserve marinade. Place fish on grill rack coated with cooking spray, skin side down; grill 5 minutes. Brush fish with reserved marinade; discard remaining marinade. Lightly coat fish with cooking spray. Turn fish over; grill 3 minutes or until fish flakes easily when tested with a fork. Garnish with onions, if desired.
*Make sure to coat the fish with cooking spray before turning it so it won't stick to the grill.