To make the couscous, add the boiling water or stock to the couscous in a large bowl. Cover and leave to rest for 10 minutes.
Once the couscous has absorbed the liquid add the chopped corianders, lemon zest and juice and the cherry tomatoes. Season if required.
In the meantime rub each of the salmon fillets with a little oil then transfer to a barbecue, cook for 10 - 12 minutes until cooked through, turning once or twice.
Spoon some couscous onto a plate and sprinkle with some fresh herbs.
Add the barbecued salmon on top of the warm couscous, add a few slices of lemon and enjoy!