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1
Set a colander over a bowl.
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2
In a large enameled cast-iron casserole, heat the oil until shimmering.
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3
Add the lamb, season with salt and pepper and brown over high heat, stirring occasionally, 8 minutes.
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4
Transfer the lamb to the colander; wipe out the casserole.
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5
Melt the butter in the casserole.
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6
Add the onion, turnips, carrots, celery, garlic, thyme and water and season with salt and pepper.
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7
Cover and cook over moderately low heat, stirring occasionally, until the vegetables are just tender, about 15 minutes.
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8
Return the lamb to the casserole.
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9
Stir in the tomato paste and cook for 1 minute.
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10
Sprinkle with the flour and cook for 1 minute.
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11
Pour in the stock and bring to a boil.
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12
Simmer over low heat, stirring, until the sauce has thickened, 10 minutes.
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13
Season with salt and pepper.
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14
Transfer the lamb to eight 1 1/2-cup ramekins or gratin dishes.
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15
Let cool.
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16
In a medium saucepan, combine the milk, cream, butter, oil, rosemary, bay leaf, thyme and a pinch of nutmeg and bring to a boil.
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17
Remove from the heat and let stand for 20 minutes.
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18
Meanwhile, preheat the oven to 400.
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19
In a large saucepan, cover the potatoes with water.
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20
Add the garlic and a large pinch of salt and bring to a boil.
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21
Cook over moderately high heat until the potatoes are tender, 12 minutes; drain.
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22
Return the potatoes and garlic to the saucepan and shake over high heat until dry.
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23
Pass the potatoes and garlic through a ricer into a large bowl.
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24
Strain the milk mixture over the potatoes and stir it in.
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25
Season with salt and pepper.
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26
Spread the mashed potatoes over the lamb.
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27
Bake in the upper third of the oven for 20 minutes, until the filling is bubbling.
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28
Preheat the broiler.
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29
Broil 4 inches from the heat for 2 minutes, until browned.
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30
Let rest for at least 10 minutes before serving.