In a large bowl, mix together the shredded cabbage, carrots, radishes, green onions, celery, and Brussels sprouts.
In a small bowl, stir together the mayonnaise, vinegar, lemon or lime zest and juice, honey, mustard seeds, salt and pepper.
Combine the dressing with the slaw and refrigerate for 1-2 hours before serving. Enjoy as a side to your favorite BBQ, as a fresh topping for fish tacos, or piled on top pulled pork sliders.