Let the fish cook undisturbed for 2 minutes, then use a large spoon to baste the meat side of the fish with the hot butter. Do this constantly for 90 seconds, then give it a rest. Thin pieces of trout will only need this quick basting to cook through, but thicker pieces of fish will need a second or even third round of basting. When you are done basting, salt the meat side. The skin side should lift off the pan easily after about 4 to 5 minutes of steady cooking. The moment you take the fish off the heat, salt the skin side.