Spread sliced onion pieces from one onion, on tin foil the length of the salmon.
Lay salmon whole or fillet pieces on top of the onion slices.
Salt & Pepper to taste.
Lightly spread butter or margarine on salmon.
Sprinkle with your hand, brown sugar over salmon (Medium coverage).
Cover salmon with remaining onion slices.
Cover salmon with two pieces of tin foil and crimp sides together. Place on grill and check after about 10 minute Do not over cook the salmon. When salmon changes color and can be flaked with a fork your fish is done.