Prepare the Poppy Seed Dressing. In a medium bowl, combine all the ingredients together until well blended. Set aside.
Prepare the salad. In a large bowl, combine the cabbage, carrots, scallions, parsley, and apples. Pour in the reserved dressing and toss until well blended. Refrigerate at least 1 hour before serving, mixing the salad at least once to evenly distribute the dressing.