In a food processor or high-powered blender, combine all of the ingredients. I find that the food processor gave me those nice little chunks you see whereas the blender completely pureed and emulsified the ingredients. The method you choose is entirely your preference.
Taste for seasoning, adding more salt or pepper if necessary.
I like to serve this tossed in the Couscous salad immediately but it will store refrigerated for a few days, though you might see some separation. Just store in a bottle and shake well before using.