Arabic fish stew with lemon and saffron and giant couscous

Ingredients

• 100 g moghrabieh (giant couscous)
• olive oil
• 2 large onions, chopped
• 2 large leeks, chopped
• 4 cloves garlic, chopped
• 25 saffron threads
• 2 teaspoons cumin
• 1 teaspoon fresh thyme leaves
• 3 fresh tomatoes, diced
• 1 long red chilli, seeded and shredded
• 3 bay leaves
• 750 ml water
• 1 kg of cod fillet
• 1/2 cup coriander leaves, chopped
• squeeze of lemon juice