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Put the couscous into a heatproof bowl. Using a pestle and mortar, grind the saffron to a powder, then place in a small saucepan with the preserved lemon and vegetable stock. Bring to the boil and pour over the couscous. Stir well, cover the bowl with cling film and leave to sit for 5–10 minutes.
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Meanwhile, finely dice the cucumber and roughly chop the herbs.
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Uncover the couscous and fluff it up with a fork. Add the cucumber, herbs, chickpeas, extra virgin olive oil and a little lemon juice. Mix well and season with salt and pepper. Set aside.
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Place a large, non-stick frying pan over a medium–high heat. Drizzle the tuna steaks with the olive oil and season both sides with salt and pepper. When the pan is smoking hot, add the tuna and cook for 2 minutes on each side.
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Spoon the couscous onto plates and place the tuna on top. Sprinkle each plate with the sumac and serve with lemon wedges and a green salad.
If you have more time… make the Moroccan Carrot Salad on page 205 to go with this. It will turn a simple lunch into a feast.