Preheat oven to 375°.
Combine dried onion soup mix and mayo in a bowl.
Place salmon onto a baking dish
And season with salt and pepper.
Spread onion mayo evenly over salmon and cover with foil.
Bake for 20 minutes, or until cooked through (time may vary depending on the thickness).
Remove foil and broil until crust has browned
Sprinkle over lemon juice.
