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For the broth, bring the stock to a simmer in a large pan. Add the harissa and vegetables, bring back to the boil, then reduce heat and simmer for 15 mins. Add the figs and continue to cook for 5 mins more until the veg is tender.
Meanwhile, put the couscous and half the chickpeas into a bowl, add the butter, and season. Pour 350ml boiling water over the couscous, cover with cling film, leave aside for 10 mins, then fluff up with a fork.
In a separate bowl, combine the red onion, spring onions, harissa, olive oil, remaining chickpeas, lemon juice and coriander, then mix into the couscous. Pile onto a large deep serving dish, ladle over the braised vegetables and broth, and sprinkle with the preserved lemons and chopped mint.