How To Prepare
1
Preheat oven to 400°F.
2
Toss onions and oil in a 9-by-13-inch baking pan until coated. Cover with foil. Bake until softened and juicy, about 45 minutes.
3
Remove foil, stir and continue baking, uncovered, until the onions around the edges of the pan are lightly golden, 25 to 30 minutes.
4
Stir in orange zest, orange juice, vinegar, rosemary and crushed red pepper. Bake until most of the liquid has evaporated, about 30 minutes.
5
Stir in shrimp and bake until cooked through, 20 to 25 minutes. Stir in scallion greens and serve.
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Jumbo Prawns Balsamic-Orange Onions