In a large serving bowl, combine mayo, yogurt, lime juice, sugar, salt and a few cracks of pepper.
Whisk to combine.
Add cole slaw mix, herbs, onions, and seeds and toss to coat.
Refrigerate for at least four hours to allow the flavors to meld, then serve.
If making a day ahead, add the seeds to the coleslaw right before serving so they stay crunchy.
