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1
Preheat oven to maximum temperature.
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2
Trim lamb of all fat and sinew.
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3
Rub with juice of 1 1/2 lemons, then with flour.
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4
Season and make 12 small cuts into the lamb, 1centimeter deep.
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5
Peel garlic and cut into 12 long slivers.
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6
Insert one of these slivers into each cut along with a sprig of rosemary.
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7
Push in with top of knife.
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8
Set aside.
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9
Slice potatoes and onion into 1/4 centimeter slices.
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10
Melt half the butter in a roasting tray and toss vegetables in it.
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11
Add 500 millilitres of the stock.
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12
Put rack in roasting tray and put lamb on top.
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13
Cook in preheated oven until it reaches 75C on the meat thermometer (for medium rare).
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14
Chop mint finely amd mix with juice of half of one of the lemons and rest of the butter.
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15
When lamb is redy let it rest, loosely covered, in a warm place for 10 minutes.
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16
Strain pan juices carefully into pan and set vegetables aside in a warm place.
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17
Add the remaining stock to the pan, degrease and boil over a high heat until thickened.
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18
Whisk in mint butter bit by bit.
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19
Season.
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20
Slice lamb.
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21
Put vegetables on plates, top with lamb and spoon sauce over.
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22
Garnish with chopped parsley.