Combine mincemeat, apples, raisins, cranberries, walnuts, brown sugar, lemon juice and rum or apple juice in a glass or plastic bowl, mix well. Cover and refrigerate overnight.
The next day, remove mincemeat filling from the refrigerator and let come to room temperature.
Preheat oven to 425 degrees. Meanwhile, prepare pastry according to directions. Stir mincemeat filling and pour into prepared pie plate. Top with second pie crust, crimp edges and make slits or make a lattice top.
Bake in preheated oven on low shelf for 40 minutes or until golden brown. Watch carefully, you may need to cover the edges with foil to prevent burning.
Papa's Pie Crust Recipe: http://www.cookingmamas.com/papas-pie-crust.html