Prepare poppy seed dressing by combining cider vinegar, mayonnaise, poppy seeds, honey, and soy sauce in medium bowl. Stir until well-blended and set aside.
In a large bowl, combine broccoli stem, cabbage, carrots, scallions, parsley, and mango. Pour in the reserved dressing and toss to combine. Refrigerate at least one hour before serving, mixing at least once to evenly distribute the dressing.
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