Roll the dough into a rectangle 12 by 16 in/30 by 41 cm. Cut the dough into twelve 4-in/10-cm squares.
Fold each square diagonally in half. Position a folded square so that the corner opposite the fold is pointing away from you. Insert the tip of the knife about ¼ in/0.6 cm from the corner and ½ in/1 cm from the edge of the dough and cut down through the dough,