Peel and chop the vegetables into medium-sized chunks so they are visible in the couscous.
Poach all of the vegetables until cooked. Start with the onion and, once transparent, add the pepper and the carrot. Add the courgette and the tomato last.
Boil some water in a saucepan. When it starts to boil, remove the saucepan and add the couscous. Leave to rest for 5 minutes.