Salmon is already a moist, fatty fish but it grows even more so with a lustrous coating of mayonnaise, mustard and honey. The onions lend a bright note.
Preheat oven to 350 degrees.
Lay the salmon fillet on a foil-lined oven tray. Lightly salt and pepper the top of the fish.
Mix all the sauce ingredients together and cover fillet with the sauce. Sprinkle diced onions on top.
Bake for 30 minutes.
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