Couscous with tomato and onion

This wonderfully comforting couscous is based on a dish Sami’s mother cooked for him when he was a child. All we did was add a crust, similar to Iranian tadik, which is a famous rice dish cooked in such a way that a crispy crust forms at the bottom of the pot; this crunchy bit is everybody’s favourite. Good-quality stock is important here. Serve with Grilled fish skewers with hawayej and parsley,