To assemble the turnovers, make small balls of masa of about 1 inch in diameter. You will need 2 small balls per turnover. Cover a tortilla press with plastic, place a small ball in the center and press to make a disc, put it aside and do the same with the second small ball. Fill one of the discs with about 1-2 tablespoons of filling, leaving a border of about ½ inch. Place the second disc on top of the filling. Press the borders with your fingers to seal it and then crimp the edge with your thumb. Continue this process until you are done assembling all the turnovers.