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1
Preheat the oven to 350 degrees F.
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2
Season the salmon with 1/4 teaspoon salt, place in a baking dish and roast until cooked through, about 18 minutes.
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3
While the salmon is cooking prepare the sauce.
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4
Cut 1 of the grapefruits into sections by cutting off the top and bottom of the fruit, then standing it on 1 end, cut down the skin to remove the pith and peel.
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5
Then, with a paring knife, remove each segment of fruit from its casing and cut the segments in half.
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6
Set the segment pieces aside.
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7
Juice the other grapefruit and set the juice aside.
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8
In a medium skillet, heat the oil over a medium heat.
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9
Add the shallot and saute until softened, about 2 minutes.
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10
Add the ginger, grapefruit juice, honey, and cayenne pepper and bring to simmer.
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11
Cook until sauce is reduced by about half about, 10 minutes.
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12
Add lemon juice and season with salt, to taste.
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13
Right before serving, toss the grapefruit pieces and basil into the sauce.
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14
Put the salmon onto a serving dish.
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15
Spoon sauce over the salmon and serve.