Heat 1 tbsp of the oil in saucepan. Add the cumin, garlic, coriander and paprika and fry over a low heat for 1 minute, stirring.
Add the stock and saffron and bring to the boil. Add the spring onion and then pour in the couscous in a steady stream and give it a stir.
Cover the pan with a lid, remove from the heat and set aside for 5 minutes, to allow the grains to swell and absorb the stock.
If you are serving this warm, stir in the rest of the oil and the remaining ingredients now.