Tasty and simple potato salad

I received some purple fingerling potatoes this week and was wondering what to do with them. I saw this recipe on a flyer and decided to give it a try. It's easy to make and quite good, a great salad for those summer picnics ahead, too. Take care not to overcook the potatoes, otherwise they'll fall apart and the salad will become pasty (I almost ended up there!) I didn't have radishes on hand, so I substituted chopped celery, and it worked out fine.