1.Mix yeast, 1/2 cup warm water and 1/4 cup sugar, Leave it to get frothy.
2. In a large bowl add flour, milk powder, remain sugar, salt, bread improver and margarine.
3. Pour frothy yeast mixture into flour and add egg. Add enough warm water to get a nice smooth dough.
4. Cover and let rise for 1 hour. Knead dough on floured surface for 10 mins .then cover again and leave rise for 1/2 hour or soft to touch.
5. Cut few portions of dough size of tennis balls. Roll out thinly , 1 cm thickness. Spread chocolate filling and rolls and twist. Shape it up to join each ends. Make a slit on the surface.
Leave to rise for 1 hour. Heat oven to 250 C and spray water on buns, Sprinkle with sesame seeds.
Put the buns in preheated oven and bake for 10 mins or till golden. Enjoy !!