Cabbage and radicchio get the sweet-treatment, thanks to honey.
Whisk together honey, vinegar, and salt in a small bowl. Add oil in a slow, steady stream, whisking until well blended. Season with pepper. Toss together cabbage and radicchio in a large bowl. Add dressing; toss to combine. Cover, and refrigerate at least 5 minutes. Just before serving, toss again.
Slaw can be refrigerated in an airtight container up to 1 day.