Bring the couscous and stock to the boil, cover and leave for approx. 7 mins. until the moisture is absorbed. Blanche the spinach in boiling water for approx. 3 mins. then drain well.
Place the sweet potatoes on a baking tray lined with baking paper and mix with 1 tsbp. oil.
Bake: for 15-20 mins. in the centre of an oven preheated to 180°C. Leave the sweet potatoes to cool.
For the dressing, mix the lemon juice with 1 tbsp. oil and season. Place all the ingredients into a bowl, mix, leave to infuse for approx. 10 mins., then season again if required.