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1
To prepare the marmalade, bring the onions and stock to a simmer in a heavy-bottomed saucepan over medium-high heat.
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2
Reduce the heat to low, cover, and let gently simmer for 1 hour, stirring occasionally.
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3
Meanwhile, put the cream in a small heavy-bottomed saucepan and bring to a simmer over medium heat.
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4
Reduce the heat to low and simmer for 30 minutes or until the cream reduces by half.
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5
Uncover the onions, add the salt and pepper, and increase the heat to medium.
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6
Cook the onions, stirring occasionally, for about 10 minutes or until the liquid begins to get syrupy.
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7
The onions should be very slightly browned.
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8
Stir in the reduced cream and simmer for about 20 minutes or until the mixture is a little thicker than heavy cream.
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9
Add the vinegar, stir to combine well, and simmer for 1 to 2 minutes to meld the flavors.
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10
Keep warm while cooking the fish.
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11
(Cooled and then tightly covered, the marmalade will keep in the refrigerator for 2 to 3 days.)
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12
Preheat the oven to 400 degrees F.
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13
Rinse the flounder and pat dry.
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14
In a shallow plate, combine the flour, salt, and pepper.
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15
Dredge both sides of the flounder in the seasoned flour, shaking to remove the excess.
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16
Heat the oil and butter in a large skillet over medium-high heat until the butter begins to sizzle.
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17
One at a time, carefully lay the flounder in the skillet, white-skin side down.
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18
After 2 minutes, sneak a peak at the bottom side to make sure it is browning without burning, but don't be timid--a nice nutty brown is good.
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19
Carefully turn the flounder with a spatula and cook about 2 minutes or until browned.
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20
Transfer the fish to a baking sheet large enough to hold them all in a single layer.
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21
Roast the flounder in the top third of the preheated oven for 6 to 8 minutes, depending on their size.
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22
Look closely: the inside of the fish should be just flaky and opaque.
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23
It is important not to overcook them.
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24
While the fish are roasting, warm the marmalade to a simmer.
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25
Place the fish on warm serving plates, top with the warm sauce, and serve immediately.