Lewis's Israeli Chocolate Challah Bread

Chocolate challah bread is on the menu today. Lewis's family come from Israel, where challah bread is cooked and eaten on special occasions. It's a dish he really likes to eat, so he has decided to make it for his friends to enjoy too. The chocolate Lewis uses is dark chocolate and might be a little bit different to the type of chocolate that his friends are used to eating, so let's see if they like it in his recipe.