To make the lattice, roll the other half of your dough to 10 inch round. Cut evenly into 12 strips. Place 6 strips parallel across the top and fold every other strip back halfway. Place 1 strip crosswise just past the fold in the center of the pie, and fold the strips back. Next, fold back the opposite strips and place another strip crosswise about 1 inch from the previous strip. Repeat this process on all sides until your lattice is complete. Trim strips to edges of the skillet. Brush top with beaten egg.