Preheat oven to 200°C (180°C fan) mark 6. Put aubergine and courgette into a large roasting tin and toss through 1tsbp oil and plenty of seasoning. Roast for 10min. Carefully remove from oven and add remaining vegetables and preserved lemons to the tin. Return to oven and cook for a further 25min.
Step 2
While the vegetables are cooking, bring a large pan of water to the boil and cook giant couscous according to pack instructions, about 8min. Drain and stir through 1⁄2-1tsp harissa, most of the mint and feta. Cover to keep warm. In a small bowl, stir 1⁄2tsp harissa into the natural yogurt and set aside.
Step 3
Meanwhile, cut the lamb into 2.5cm (1in) rounds and transfer to a large bowl. Sprinkle over the coriander, cumin and plenty of seasoning and rub into the lamb. Heat remaining oil in a large frying pan, and fry the lamb for 8-10min until golden and cooked through but still soft.
Step 4
Transfer couscous to a large platter, top with vegetables and lamb, sprinkle over remaining mint, feta and pomegranate seeds, if you like, and serve with harissa yogurt.
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