Dust a clean work surface with a pinch of flour. Roll the dough into a large rectangular sheet (about 0.3cm thick) using a rolling pin. Apply even pressure to keep the thickness consistent.
Spread the cooled scallion oil evenly over the entire surface of the dough (cover every corner). The oil layer should be thick enough to hide the dough’s color.
Fold the dough into thirds (like folding a letter). Use the rolling pin to gently flatten the folded dough for better adhesion.
Cut the folded dough in half from the middle, creating two equal rectangles.
Slice each rectangle into evenly thin strips (about 0.5cm wide). Use a sharp knife and cut quickly in straight lines for uniform strips.
Combine all the strips and divide them evenly into 8 portions (each portion has 6-8 strips, depending on thickness).
Take one portion of strips and gently stretch it to 20-25cm long (pull softly to avoid breaking). Wrap the stretched strips around your fingers a few times to form a spiral flower shape. Press the small tail of the strips firmly onto the bottom to secure.
Gently reshape the spiral into a neat round flower roll. A beautiful Chinese scallion flower roll is now ready!