For this recipe, there is no need to cook the broccoli.  This easy recipe is made with raw broccoli because the dressing softens it the longer it sits.  Make sure to cut the florets small for the best texture. On the other hand, if you don't like the taste of raw broccoli, or you need it to be softer because of recent dental work, blanching the broccoli is the easy way to go.  Just blanch it for 1 minute in boiling water, then transfer it to an ice bath.  Drain and cool before using in the salad.