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1
Preheat the oven to 220C (425F), Gas mark 7.
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2
First, prepare the lamb - remove the papery skin if it is still attached, then score the fat in a criss-cross pattern with lines 12cm ( 1/2 3/4 inches) apart, trying not to cut into the meat.
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3
In a bowl, mix together the rosemary, mustard olive oil and garlic and rub the lamb all over with this mixture.
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4
Season with salt and pepper and place in a roasting tin and cook in the oven for 25 - 35 minutes, depending on the weight of the lamb and how pink you like it to be.
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5
Remove from the oven and allow the meat to rest for 10 minutes before serving, then cut between the chops and give each person 23 each.
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6
For the mustard mash: I find this is the best way to cook good, fluffy floury potatoes.
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7
Clean the potatoes and put them into a saucepan of cold water with a good pinch of salt.
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8
Bring the water up to the boil and cook for 10 minutes.
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9
Pour all but 4cm (1 1/2 inch) of the water out and continue to cook the potatoes on a very low heat.
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10
Dont be tempted to stick a knife into them, the skins will break and theyll just break up and get soggy if you do.
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11
About 20 minutes later, when you think the potatoes might be cooked, test them with a skewer: if theyre soft, take them off the heat.
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12
Peel the potatoes while theyre still hot and mash them immediately.
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13
To peel them while theyre hot, hold them in a tea towel (not your fancy ones).
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14
Add the butter, but dont add any milk until theyre free of lumps.
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15
When the potatoes are mashed, add boiling milk (or milk and cream).
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16
You might not need it all or you might need more, it depends on the potatoes.
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17
Add the Dijon mustard to taste and some salt and pepper.
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18
If you want to make this in advance, add a little extra milk, as the potatoes dry out as they sit.
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19
It will keep well in a warm oven just keep it covered with a lid, plate or tin foil.
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20
For the minted peas: Melt the butter in a hot frying or saute pan.
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21
Add the mint, lemon juice and the peas and cook on a high heat for about 2 minutes until the peas are cooked.
