Ready-made mayonnaise is a bit sweet but tastes fine when balanced by acidic ingredients such as the vinegar and capers here. It's good with both the fish and potatoes.
Plus: More Seafood Recipes and Tips
Heat the oven to 400°. In a large roasting pan, toss the potatoes with 1/4 cup of the oil, half the garlic, and 1/4 teaspoon each salt and pepper. Put in the oven for 15 minutes; stir once.
Meanwhile, coat the swordfish with the remaining 1/4 cup oil, garlic, 1/4 teaspoon each salt and pepper, and the rosemary. Put the fish on a baking sheet and put it in the oven along with the potatoes. Cook, stirring the potatoes once, until the fish and potatoes are both done, 10 to 12 minutes for 1-inch-thick steaks.
In a small bowl, combine the mayonnaise with the parsley, capers, and vinegar. Serve the roasted swordfish and potatoes with the caper mayonnaise.
Variations Try tuna, salmon, or codfish steaks instead of the swordfish. Fillets will also be good in this recipe, but you'll need to cut down on the cooking time. If you do, be sure the potatoes still cook for twenty-five minutes. Just put the fish in later.
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