In a medium bowl, whisk together the mayo, apple cider vinegar, mustard, maple syrup, celery seeds, salt, and several grinds of fresh pepper.
Coleslaw Preparation
In a large bowl, toss together the cabbage, carrots, and scallions. Pour the dressing over the top and toss to coat. Season to taste with more salt and pepper, as desired.
Notes
For best results, use a high-quality mayonnaise or make your own.