Creamy Curried Cole Slaw-need culinary help

I love coleslaw, but it is loaded with fat making stuff.

So I tried something new and it came out bitter.

Here are the ingredients:

packaged coleslaw mix (cabbage and carrots)
plain fat free yogurt
cilantro
curry powder
white wine vinegar
salt and pepper

It would be excellent if not for the bitter finish.

Any thoughts on where the bitterness comes from? Solutions?