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Heat the grill. Put the couscous, sultanas, most of the coriander, 1 tsp cinnamon and some seasoning in a bowl. Pour over the hot vegetable stock and set aside for 5 mins to soak.
Mix together the pinch of cinnamon, honey and oil. Sit the salmon in a baking tray, spread over the honey mixture and season. Cook under a hot grill for about 8 mins until the fish is cooked through.
Meanwhile, swirl together the harissa and yogurt. Fluff up the couscous with a fork and serve with the fish and yogurt, sprinkled with the remaining coriander alongside some green beans, if you like.