Broiled Bluefish with Red Onion and Citrus Dressing

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Ingredients

1. 1/4 cup olive oil
2. 2 tablespoons grapefruit juice
3. 2 tablespoons lime juice
4. 3/4 teaspoon salt
5. 2 tablespoons chopped fresh chives or scallion tops
6. 2 pounds bluefish fillets, cut to make 4 pieces
7. 1 small red onion, cut into thin slices
8. 1/4 teaspoon fresh-ground black pepper

1. In a small bowl, combine the oil, grapefruit juice, lime juice, 1/4 teaspoon of the salt, and 1 tablespoon of the chives.
2. Put the fish, skin-side down, in a shallow glass dish or stainless-steel pan. Scatter the onion over the fish. Pour half of the citrus dressing over the top; let marinate for about 15 minutes.
3. Heat the broiler. Put the fish, skin-side down, on a broiler pan or baking sheet. Sprinkle with the remaining 1/2 teaspoon salt and the pepper. Top with the onion. Broil the fish, about 6 inches from the heat if possible, until just done, about 5 minutes for 3/4-inch-thick fillets.
4. Pour the remaining dressing over the hot fish and sprinkle with the remaining tablespoon of the chives.