Spray onion with oil and place on a baking paper lined tray. Place John West Salmon fillets with crust on same tray and cook following salmon oven packet directions. Spray tomatoes with oil and add to the same tray after 5 minutes.
Meanwhile, steam asparagus for 2-3 minutes or to your liking.
Toss asparagus and onion together, season to taste and drizzle lightly with oil. Serve salmon with vegetables and tomatoes.
Serve with lemon wedges or tartare sauce.