Roll out the dough and cut it into squares (or circles), about 4x4 inches. Add 2 tablespoons of the pear filling in the center of each square and brush a little of the egg white on the edges. Fold the dough to create rectangles and seal the edges with a fork. With the tip of a knife, make a few small cuts along the top. Place the turnovers on a baking tray lined with parchment paper.