Place a large casserole dish over a high heat and add a generous dash of olive oil. Once the oil is hot (but not smoking), add the lamb shoulder in small batches and brown all over. Remove from the dish and set aside on kitchen towel to rest
Add a dash more oil to the pan and turn down to a medium heat. Add the onion, garlic and ginger and cook until soft and translucent. Add the coriander seeds and continue to cook until aromatic
Add the wine, allow to boil for 2 minutes, then add the passata and stir to combine. Return the lamb back to the dish and cover with stock. Add the saffron and cinnamon stick and simmer for 30 minutes
Drain the chickpeas and add to the casserole dish, along with the lemons, apricots and olives. Cook for a further 20 minutes, or until the lamb is soft and tender
chickpeas, 1 small tin, or 1 jar of Navarrico chickpeas if available
If by this time the sauce has not thickened adequately, remove some of the liquid from the dish and reduce in a small pan over a high heat. Once reduced, pour back into the casserole dish
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Before serving, remove a ladleful of sauce from the dish and reduce over a high heat to achieve a gravy-like consistency. Add a spoonful of harissa to the sauce and set aside in a serving jug
Meanwhile, prepare the couscous. Place the couscous in a heatproof, flat container. Pour in the boiling water and add a pinch of salt. Stir through and cover tightly with cling film