Put the fish in a pot and marinate it with cooking wine, salt, onion, ginger, garlic, monosodium glutamate, a little vinegar, sugar and star anise. Cut some small mouths on the fish to make it tasty, then put Chili powder on the fish and marinate it in the fresh-keeping layer of the refrigerator for more than an hour. Of course, it will be more delicious after a long time.