Preheat oven to 350 degrees. Place salmon skin side down in a baking dish. In a small bowl combine brown sugar, soy sauce, and olive oil. Whisk marinade together until the sugar dissolves. Pour over salmon. Bake for about 15 to 20 minutes or until fish easily flakes when a fork is pressed into the flesh.
If desired serve with some fleur de sel and some lemon wedges.