Combine the first 8 ingredients in a large zip-top plastic bag; add salmon fillets. Seal bag, and marinate in refrigerator 30 minutes, turning bag once. Remove fillets from bag; discard marinade.
Place fillets on broiler pan coated with cooking spray. Broil 11 minutes or until fish flakes easily when tested with a fork. Sprinkle each fillet with 1/2 teaspoon sesame seeds and 1 tablespoon onions.