Preheat the oven to 400 degrees F (200 degrees C). Roll out dough for bottom crust; place in a 9-inch pie plate. Press to fit without stretching dough; trim edges until even with pie plate.

Combine pears, apples, sugar, flour, cinnamon, ginger, salt, and lemon juice in a large bowl. Spoon into prepared pie crust.

Roll out dough for top crust. Place onto filled pie or cut into strips creating a lattice top. Trim 1/2 inch beyond the edge and fold under bottom crust edge to seal. Crimp and flute edges. Cut slits in top crust or prick with a fork to allow steam to escape. Brush crust with milk and sprinkle with cinnamon sugar.

Bake in preheated oven for 30 to 40 minutes or until apples are tender and crust is golden brown.