To cut pork roast so that it can be filled and rolled, cut horizontally down length of pork about 1/2 inch from top of pork to within 3/4 inch of opposite side; open flat. Turn pork so you can cut other side. Repeat with other side of pork, cutting from the inside edge to the outer edge; open flat. If pork is thicker than 3/4 inch, cover pork with plastic wrap and pound until about 3/4-inch thickness. Remove plastic wrap.