On a well-floured surface, pat the pre-dough into a square. Stretch each corner outwards about 4" making an X shape.
Place the
butter block in the middle and fold the stretched corners of the dough over the
butter block. Pinch the seams together to completely seal the
butter inside the dough. Sprinkle the dough with some
flour and roll the dough into a 12 x 20" rectangle. If the
butter shows in places, pinch the dough to reseal it.