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1
Arrange one oven rack in the lowest position.
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2
Place another oven rack 8 inches from the broiler heat source.
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3
Preheat the oven to 450F.
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4
Bring the vinegar, amaretto, port, wine, and fennel to a boil over high heat in a medium saucepan.
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5
Continue boiling rapidly until syrupy and reduced to 1/3 cup, about 20 minutes.
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6
Meanwhile, heat a large ovenproof skillet over high heat.
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7
Season both sides of the duck breasts with salt and pepper.
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8
Add the oil to the pan, swirling to coat the bottom, then add the duck, skin side down.
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9
Transfer the pan to the lowest rack in the oven.
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10
Cook until the skin is dark golden brown and the meat feels firm, 10 to 12 minutes.
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11
Transfer the duck to a rimmed baking sheet, skin side up.
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12
Let rest for 5 minutes.
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13
(The meat will be medium-rare.)
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14
Heat the oven to broil, preferably a low broil setting if you have it.
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15
With another heavy skillet, firmly press down on the almonds until they are all crushed into tiny bits.
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16
Spread the crushed almonds in a thin, even layer.
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17
Spoon 1/2 teaspoon honey on the skin side of each duck breast, then press into the almonds.
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18
Return to the baking sheet, skin side up.
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19
Fill in any gaps with the almonds; the whole skin side should be evenly coated.
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20
Broil until the almonds are toasted and the sugar starts to melt, about 7 minutes.
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21
Check on the crust occasionally; you dont want the almonds to burn before the sugar starts to melt.
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22
Remove from the broiler and let rest for 5 minutes.
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23
While the duck rests, heat the sauce over low heat until hot.
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24
Whisk in the butter, a little at a time, until the sauce emulsifies.
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25
Season the sauce with salt and pepper to taste.
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26
Divide the sauce among serving plates and arrange a duck breast on each.