Combine the kohlrabi, apple, red onion, and chives in a large bowl. Lightly season with salt and black pepper.In a small bowl, whisk together the mustard, honey, and vinegar. While whisking, slowly pour in the olive oil, whisking until the dressing has emulsified. Season with ¼-1/2 teaspoon kosher or sea salt and black pepper.Toss the slaw with the vinaigrette. Using a vegetable peeler or cheese plane, shave the cheese over the slaw and serve.