Twisted Korean doughnuts (Kkwabaegi: )

These kkwabaeggi (), or twisted donuts, were one of my favorite after-school treats when I was a kid, something you can still find in many Korean bakeries and being sold on Korean streets today.
Full recipe: http://www.maangchi.com/recipe/kkwabaegi
My cookbook: http://www.maangchi.com/real