One to three days before cooking: Defrost sablefish overnight if frozen. (In a pinch, defrost sablefish in microwave with timed defrost setting for 4 to 6 minutes.)
Eight hours to one day before cooking: Mix red miso, soy sauce, honey, and rice wine (or sake) if using, in a small bowl. Add this marinade mixture to a plastic bag large enough to fit the sablefish.
Add sablefish to the plastic bag, take out as much air from the bag as possible, and seal. Massage the outside of the bag to spread the marinade over the fish.
Put plastic bag in the refrigerator and marinate for at least 8 hours or up to 2 days. If you remember, periodically massage the fish in the bag and mix it around to get more of the marinate coating all parts of the fish.
When ready to cook, heat pan on medium heat. Insert a piece of parchment paper large enough to cover the entire bottom of the pan.
Scrape off ALL the marinade off the sablefish so the sugar in the marinade does not burn. If you don’t scrape off the marinade, you will have a very burnt-looking fish.
Add the sablefish to the parchment-lined pan and cook for 5 minutes on each side for a total of 10 minutes.
Serve with steamed rice and steamed vegetables. Baby bok choy, choi sum, and green beans are great accompaniments.