The difference between a Swiss "Zopf" and a Challah:
Challah seems to come from the arabic culture. They do have much in common though. They use eggs and fatty components. In a "Zopf" it's milk instead of water and molten butter instead of vegetable oil.
Sorry for the video, that is placed as a file. I didn't receive my confirmation mail from youtube in time.
I will add the youtube version later, hopefully with a higher resolution.
I hope you try it out and enjoy it.
When you're interested in baking, see my other instructable.Wood fired Pizza / Bread oven