1. Preheat oven to 450 degrees. Whisk together honey, mustard, vinegar, and oil; season with salt and pepper. On a rimmed baking sheet, toss onion with 2 tablespoons vinaigrette and bake for 5 minutes. Meanwhile, stir one tablespoon vinaigrette into breadcrumbs. Coat fish with one tablespoon vinaigrette and season with salt and pepper; top with breadcrumb mixture and add to sheet. Bake until fish is cooked through, about 7 minutes.
2. In boiling, salted water, cook green beans until crisp-tender, about 4 minutes; drain and toss with onion and 1 tablespoon vinaigrette. Refrigerate remaining vinaigrette in an airtight container. Serve fish with vegetables.
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Honey-Mustard Salmon with Green Beans from Everyday Food recipe