Rinse salmon, pat dry, and lay skin down in a lightly oiled shallow 3-quart casserole (about 9 by 13 in.). Rub 1/4 teaspoon pepper over salmon.
Bake in a 400° oven until fish is opaque but still moist-looking in center of thickest part (cut to test), about 15 minutes.
Meanwhile, in a 1- to 1 1/2-quart pan over high heat, combine rosemary, marmalade, balsamic vinegar, and onion. Boil, stirring often, until reduced to 1/2 cup.
Cut salmon into equal pieces; use a wide spatula to transfer to plates. Spoon onion mixture over and around salmon. Add salt to taste.
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* The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.