Apple Crumble Pie

Name: Apple Crumble Pie
Prep time: 30 min
Total time: 30 min
Cuisine: American
Ingredients: 1 recipe basic pie dough; 3 lb. assorted sweet-tart apples (such as Granny Smith or Honeycrisp) cored, peeled, and sliced ½” thick; 2 tbsp. freshly squeezed lemon juice; 1/2 c. packed brown sugar; 1/4 c. plus 2 tsp. all-purpose flour, plus more for rolling; 1 tsp. ground cinnamon; 1/2 tsp. freshly grated nutmeg (optional); 1/4 tsp. kosher salt; 1 1/3 c. all-purpose flour; 3/4 c. packed brown sugar; 1/3 c. finely chopped walnuts; 1 tsp. kosher salt; 1/4 tsp. ground cinnamon; 1/2 tsp. ground allspice (optional); 1/2 c. melted butter