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1
Preheat the oven to 325.
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2
Prick the duck all over with a sharp knife.
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3
Season the cavity with salt and pepper and stuff it with the orange and lemon wedges.
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4
In a medium roasting pan, combine the water, coriander seeds and duck neck.
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5
Place the duck on a rack, season with salt and pepper, set it in the roasting pan and cover with foil.
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6
Bring the water to a boil over high heat.
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7
Transfer the duck to the oven and roast for 1 hour, until most of the fat has been rendered.
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8
Transfer the duck to a work surface.
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9
Increase the oven temperature to 350.
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10
Strain the pan juices into a medium bowl and skim off the fat.
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11
Return the duck to the roasting pan and prick it all over a second time.
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12
Roast uncovered for 1 hour.
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13
Increase the oven temperature to 400.
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14
Tip any juices from the cavity into the roasting pan and transfer the duck to a large rimmed baking sheet.
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15
Roast the duck for 45 minutes longer, until the meat is very tender and the skin is crisp.
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16
Meanwhile, set the roasting pan over moderately high heat.
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17
Add the orange and lemon juices and boil for 1 minute.
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18
Add the reserved pan juices and the soy sauce and boil for 1 minute longer.
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19
Pour the liquid into a small saucepan and bring to a simmer over moderate heat.
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20
In a medium bowl, make a paste with the butter and flour.
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21
Whisk in 1/4 cup of the hot liquid until smooth, then scrape the mixture into the saucepan.
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22
Simmer over low heat, whisking, until the sauce has thickened, about 2 minutes.
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23
Season with salt and pepper.
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24
Transfer the duck to a carving board and let rest for 10 minutes.
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25
Carve the duck and serve with the citrus sauce.