Combine and mix ½ cup low sodium soy sauce, ½ cup brown sugar, ¼ cup orange juice, chopped scallions, 1 tbsp ground ginger, 1 tbsp 5 spice powder (chinese), 1 tbsp onion powder. Place salmon fillets in marinade in freezer bag. Marinade at least an hour (flesh side down). Save some marinade. Set oven to broil and place fish in a baking pan (single layer) Cook flesh side down for 8mins (under Broiler). Flip and coat salmon with marinade, cook for 8 mins.