kohlrabi couscous salad

I've shared one couscous salad recipe a long time ago, but this one is a little different. Kohlrabis were on discount! So I bought one. I'd never cooked anything with this veggie but I remembered there was a recipe for a salad in a book I recently loaned. And they suggested roasting Kohlrabis in oven in Radio Helsinki too, so can't really go wrong this or what!