Oh I've also include step by step photos just in case I can't quite articulate myself in the instructions!
30g butter, melted
50g butter, melted
20g black sesame seeds, ground
Method (refer to step by step photos)
Mix the ingredients for the water dough together, put in a bowl, cover and set aside. Do the same for the oil dough, and leave them both to rest for at least 30 minutes.
Preheat oven to 180C.
Divide each dough into ten pieces and form into balls (2). Flatten the water dough and wrap around and fully encase the oil dough (3). After you've formed 10 pieces, roll each one out into a long strip and roll it up (5-6). Cover and leave to rest for 10 minutes.
Flatten them and roll them up in the other direction (7-8). Then press down the middle, pull the two ends together and form a ball (9-10). Do not worry if the oil dough seems to come out a bit, just try to stretch the water dough back onto it, it's not the end of the world.
Flatten, place a spoonful of the filling (where you just mix the two ingredients together) onto the middle and wrap it around. Flatten slightly, brush with water and sprinkle on more black sesame seeds.
Bake for 20-30 minutes or until golden on top.