Place your couscous in a bowl, then add the salt and give it a bit of a mix.
Cut the butter into a 1cm (½") dice and drop it on top of the couscous, then pour over the boiling water and cover with cling film, allow it to sit for 10 minutes.
Chop as many fresh herbs as you can lay your hands on and fork them through the couscous after it has rested.
Notes
You could substitute the butter for two tablespoons of olive oil if you like.