You could broil any kind of white fish until it's browned and cooked through, and make a nice balsamic glaze for it.

To make the glaze, put like 1/4 cup balsamic vinegar in a saucepan, add ground thyme (you can buy it ground or grind it in a coffee grinder) and a little fresh lemon juice. Bring to a boil then simmer, reducing by half. It'll thicken and become kinda sweet. Spritz a little lemon on the fish before you drizzle a little glaze over them. It'll seem fancy.