Cut the roll into 8 equal parts, flatten each part on the side of the cut to make a dough with streaks. Similarly, we do with the remaining halves of light and dark dough, only put a layer of dark dough on the layer of light dough. Wrap the roll so that the top is light dough. You will get a white roll, which is also cut into 8 equal parts. Preheat the oven to 180 degrees.