Add the apples (about 8 cups total) to a large bowl. Sprinkle with brown sugar, flour, cinnamon, nutmeg, lemon juice, 1 tablespoon beer and apple sauce, toss until coated.
Roll out one of the pastry disks out on a lightly floured surface, line a 9-inch pie pan, trim off the excess.
Pour the filling into the prepared crust.
Roll out the remaining pie dough, cut with a small cookie cutter, layering the shapes over the filling. Brush with melted butter, sprinkle with sugar.
Place pie in the freezer for ten minutes while the oven preheats.
Heat the oven to 350 degrees.
Bake the pie at 350 for 40 minutes or until the pie is golden brown. Remove from oven and allow to cool for at least an hour before cutting.
In a small bowl combine the mascarpone, powdered sugar, vanilla and pale ale until well combined. Top the pie with cream prior to serving.