Place couscous, semi-dried tomatoes and the zest of 2 oranges in a large bowl. Pour over the hot stock, stir, then cover for 15 minutes until the stock is absorbed. Fluff the couscous with a fork.
Peel and segment 2 of the oranges, making sure to remove all of the white pith. Mix orange slices, spring onions, fresh herbs, nuts and salmon with the couscous. Toss gently together with CLEAN hands to combine.
Season to taste.
Whisk together the juice of the remaining orange, the olive oil, ras el hanout and pour over the salad, tossing gently to combine.
Serve yoghurt dressing on the side, allowing diners to drizzle it over their salad.
Yoghurt Dressing
Blend yoghurt, olive oil and zest and juice of one lemon, season to taste. Add more olive oil if you want a looser sauce.