"This slow-roasted lamb is a Sunday roast classic, served with a mustardy salad for a vibrant twist on the traditional...."
INGREDIENTS
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1 small shoulder of lamb (about 1.5kg–2kg/3lb 5oz–4lb 8oz)
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50ml/2fl oz vegetable oil
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100g/3½oz unsalted butter
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2 onions, sliced
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1 rosemary sprig, leaves chopped roughly
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5 large potatoes, peeled and sliced
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1 litre/1¾ pints lamb stock
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1 garlic bulb, cut in half
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salt and freshly ground black pepper
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2 Little Gem lettuces, leaves separated
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50g/1¾oz rocket
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2 tbsp olive oil
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1 tsp Dijon mustard
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1 tbsp white wine vinegar