Method
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1
Heat a large glug of oil in a large frying pan and fry the potatoes for 5 minutes.
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2
Put the cavolo nero in a colander and pour over a kettle of boiling water. Drain.
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3
Cook the potatoes for 10 minutes more, shaking the pan occasionally, until golden and tender. Season, then remove.
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4
Turn the heat to high, season the lamb. Cook for 2 minutes in a single layer, turn and cook for 1 minute. Put on a plate.
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5
Turn the heat to low, add a glug of oil and fry the onions, garlic and rosemary for 8-10 minutes until soft, stirring occasionally.
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6
Add the vinegar, then add the cavolo nero and cook on high for 2 minutes.
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7
Return the lamb and potatoes, toss to mix, then season.
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8
Serve with lemon wedges.