Roll remaining pastry; cut into 10 strips, each about 1/2 inch wide. Place 5 strips across filling in pie plate. Weave a cross-strip through by first folding back every other strip of the first 5 strips. Continue weaving, folding back alternate strips before adding each cross-strip, until lattice is complete. Trim ends. Fold trimmed edge of bottom crust over ends of strips, building up a high edge. Seal and flute. Brush lightly with milk; sprinkle lightly with additional sugar.