We use a milk bath and Progresso Bread Crumbs, Italian Style. Lightly pan fried in a little butter. A little spray of lemon or lime. Tators & peas.
Also, if available, fresh pico de gallo, for making fish tacos.
OR
Your favorite beer batter fried.
Grouper is a light flavored fish, unlike the cold water species. It does not need to be flooded with flavor like shoe leather or beaver tail or moose tong or bear ears or salmon..