I do this with whole salmon, any type, and I leave the skin on as it lifts right off after cooking. Place the salmon on a piece of foil large enough to completely wrap it. Fill the inside of the salmon with a mixture of chopped onion, celery, carrots, garlic and green peppers. Add 2 or 3 slices of lemon and several pats of butter. Salt and pepper to taste if desired, I usually don't tho. Seal the foil and cook on a grill or in an oven. The cooking time depends on the size/amount of fish, it seems that when you can really smell the salmon thru the foil, it is usually done. I know this is not the best method for determining doneness, but it usually works for me. I do open the foil and test the fish for flakeyness. The stuffing usually absorbs a lot of fat/oil from the fish and is not, in my opinion, all that good, but it adds great flavor to the fish.