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Tip the couscous into a bowl, season with salt and pepper and stir through 1 tbsp of the oil. Pour over enough hot stock just to cover and cover the bowl with cling film and set aside.
Heat the rest of the oil in a saucepan and cook the onion and carrot gently for 8 mins until softened. Add the garlic and ginger and cook for 2 mins more then stir in the ras el hanout and harissa and cook for another minute. Pour in the tomatoes and stock and give everything a good stir. Season, add the chickpeas and simmer everything gently for 20 mins until thickened slightly then squeeze over the lemon.
Uncover the couscous and fluff up with a fork. Spoon the soup into bowls, top each with a mound of couscous, scatter with coriander and serve with extra harissa for those who want it.