To make the dough: Mix as for bread, place in greased bowl in fridge for 30 minutes or overnight. Roll out to 10x16 inch rectangle for the filling: Spread melted butter on dough. Sprinkle with mixture of brown sugar and cinnamon, then raisins, can also use chopped walnuts. Roll up dough to 16 inch log and seal edges by brushing with beaten egg, then slice into 12 squares. Place on baking tray so they are not touching. Sprinkle with water and sit them in a warm place for 30 minutes or until nearly doubled in size. Brush with remaining beaten egg. Bake at 180-190c for 15-20 minutes. Mix the icing togther and spread on the buns when they are cool.