Algerian couscous

Name: Algerian couscous
Cuisine: Moroccan, Mediterranean, Southern, European, Greek, American, African
Ingredients: 1 onion, chopped; 1 large garlic clove, minced; 1 chicken, about 1.6kg, jointed into 8 pieces; 1 large carrot, peeled and cut into 4 chunks; 1 large waxy potato, peeled and quartered; 150g swede, peeled and cut into 3cm chunks; 1 large celery stick, cut into 4; 800ml water; 2 tsp salt; ½ tsp ground black pepper; 1 mild green chill;; 1 large courgette, cut into 4; 1 large parsnip, peeled, quartered, core removed; 200g can chopped tomato; 100g tinned chickpeas, drained and rinsed; ¼ tsp dried mint; 300g couscous (any type); 120ml warm water; 2 tbsp ghee or butter, melted; 1 heaped tsp ras-el-hanout