The walnuts in the crust give this pie a decadently nutty flavor that really carries this classic apple pie to new heights.
Serves 10 (serving size: 1 wedge)
1. Combine first 8 ingredients; toss to coat.
2. Place nuts in a food processor; process until finely ground. Weigh or lightly spoon 6.75 ounces flour into dry measuring cups; level with a knife. Add flour, 3 tablespoons brown sugar, and 1/4 teaspoon salt to food processor; pulse 5 times. Add butter; pulse 6 times or until mixture resembles coarse meal. With processor on, slowly add vodka through food chute, processing just until combined (do not form a ball). Turn dough out onto a lightly floured surface. Knead 3 to 4 times. Divide dough into 2 equal portions. Gently press each portion into a 4-inch circle on plastic wrap. Cover with plastic wrap; chill 30 minutes.
3. Preheat oven to 425°.
4. Unwrap and place 1 dough piece on plastic wrap. Cover with 2 sheets of overlapping plastic wrap. Roll dough, still covered, into a 10-inch circle. Place into a 9-inch pie plate coated with cooking spray. Spoon apple mixture into pie plate.
5. Unwrap and place remaining portion of dough on plastic wrap. Cover with 2 sheets of overlapping plastic wrap. Roll dough, still covered, into a 12-inch circle. Place over apple mixture. Press edges of dough together. Fold edges under; flute. Cut slits in top of dough to allow steam to escape.
6. Combine milk and egg yolk, stirring with a whisk. Gently brush top of dough with milk mixture. Place pie plate on a foil-lined baking sheet; bake at 425° for 20 minutes in the lower third of oven. Shield edges of piecrust with foil. Reduce oven temperature to 350° (do not remove pie from oven); bake an additional 30 minutes or until browned. Cool on a wire rack.