Divide the oil dough and the water dough into 15 equal portions each, the filing into 30 equal portions.
Place each oil dough within each water dough and seal.
Roll out the dough to a long oval, to about 3 mm.
Roll it up from the short end like a swiss roll.
Roll out the dough again to a long oval to about 2mm.
Roll it into a swiss roll. Do the same for the rest of the 14 pieces. Rest for 15 minutes.
Cut the roll into 2, revealing the spiral.
Press the roll down using the palm, cut side up.
Wrap each portion of filing into each dough.
Bake for 15 minutes at 220°C. Do not egg wash or you will destroy the spiral pattern.