Ingredients:
1 Pound Salmon
1/3 Cup mayonaise
1/2 Teaspoon salt
1/2 Fresh lemon
1 Medium onion, sliced
1/2 Cup grated cheese
1 Tomato, sliced
Dash paprika or black pepper

Place fish in ovenproof baking dish. Sprinkle with salt and juice from 1/2 lemon. Spread with mayonaise like you are frosting a cake. Sealing it to the bottom enhances the flavor as it keeps the salmon moist. Top with onion, tomato, and cheese. Add paprika or pepper. Bake at 375 degrees for 45 minutes. Add small amount of water to dish if necessary. I have done this with 8-10 pounds of fresh salmon by increasing the amount of mayonaise to cover the fish and seal it to the dish. Bake it just a little longer. It is very moist, and my guests always love it. Any kind of fish can be substituted for salmon.