How to Make It
Heat oven to 450° F. Place the fish on a rimmed baking sheet, drizzle with the oil, and sprinkle with the Cajun seasoning. Roast until the fish is opaque throughout, 8 to 12 minutes.
Meanwhile, in a large skillet, cook the bacon over medium heat until crisp, 5 to 7 minutes; transfer to a paper towel-lined plate. Let cool, then break into pieces.
Add the scallion whites to the drippings in the skillet and cook, stirring, until beginning to soften, 2 to 3 minutes. Add the corn, cabbage, ½ teaspoon salt, and ¼ teaspoon pepper and cook, tossing, until the cabbage wilts and the corn is tender, 3 to 5 minutes more. Add the vinegar and scallion greens and toss to combine. Sprinkle with the bacon. Serve with the fish.