Unroll dough onto a floured surface. Use a biscuit cutter to cut out rounds of dough the same size as the cups in a muffin pan (mini or regular size). Press the dough into muffin cups and up the sides. Fill each muffin cup with mincemeat filling up to 3/4 full.
Cut slightly smaller circles in the dough to make lids for each pie. In a small bowl combine the egg and water. Brush some of the egg wash onto both sides of the pastry lids. Press onto tops of muffin cups. If you have extra dough, it is traditional to cut small moons or leaves to add as décor on the pie tops.
Bake at 350 degrees for 20 to 25 minutes until dough is cooked through and a light golden color. Be careful not to overfill the pies or the filling will seep out of the crust.
Makes 6 muffin size or 12 mini muffin size pies.