Challah help : vimarsana.com

I have always been in love with the look of Challah and decided to try it for myself using a recipe from Baking and Pastry. I ran into some trouble when it came to rolling the dough pieces into logs it was very, very firm. I would do a dog bone shape with a log and try to extend but it was somewhat resisting and then started to tear as I got longer (it was still pretty thick