Put the grouper on the chopping board, sprinkle a layer of salt on it, then tie all the steel saw blades together with a rope, scrape the scales in the opposite direction, and then beat the grouper on the chopping board with several beer caps to remove the scales. Then cut open the grouper, remove the internal organs, clean the black substance in the fish belly, wipe the fish body and inner cavity with salt, and marinate with cooking wine 15 minutes.