Not sure how this will work with Halibut, but you can give it a try... it's easy, and cleanup is silly simple!
this recipe works great with steal head and the likes
Get a 8x12 ish flat baking tray deal (small cookie sheet?)
Cover in aluminum foil
Put fish skin side down in tray
Get some peper and go over the whole top! I like a lot, you can use less if you are a wimp.
Now preheat your oven to 350deg.
While that is warming up, take an entire stick of butter, and melt it in the microwave in a dish. While it's still hot, pour two tablespoons of molasses into the hot butter. Stir till blended as best you can.
now take that buttery molassesy concoction and pour it all over the fish! Coat the entire top! It will pool around the fish as it runs off if you didn't puss out, and not use a whole stick of butter.
Pop that tray in the oven and let cook for 15 minutes.
As soon as the buzzer beeps, grab some brown sugar, open the over and sprinkle the suger over the fish. You can also take a spoon and reapply some butter from your butter pool at this time.
Close oven, and switch to broil for about 5 minutes, or until the sugar starts to slightly bubble on fish. IF IT STARTS SMOKING OR TURNS BLACK, TURN IT OFF DUH!
now take your fish out, and let sit for a couple minutes.
To serve, take a butter knife, and run it between the skin, and fish. the fish will separate from the skin, as the skin is now firmly stuck to the tinfoil
Eat your damn fish......
And the best part!!!!!
Cleanup! Take foil off tray, and throw in trash, wipe off tray, done!