Preheat the oven to 425 degrees Fahrenheit and move the oven rack to the lowest position in the oven.
Place 1 refrigerated pie crust into a 9-inch pie pan and gently press it into the bottom and sides of the pan.
Pour 29 ounces mincemeat filling and topping into the prepared pie crust and spread it evenly.
Then lay out the other pie crust on a floured work surface. Use a pizza cutter, sharp knife or pastry wheel to cut the pie crust into 16 strips that are approximately ½ inch thick. Then carefully thread the strips over and under one another to make a weave topping on top of the pie. Trim off any excess overhang on the pie. Then crimp the edges of the dough with a fork or with your fingers.
Gently brush the top of the lattice topping with the lightly beaten egg. Cover the crust with foil or a pie crust shield.
Bake the pie for 30 minutes until the pie is golden brown.
Cool completely on a wire rack and then the pie is ready to serve and enjoy!
Notes
Refrigerate any leftover pie covered for up to 3-4 days. I love serving this pie fresh but you can easily make this pie the night before serving.