- Streusel topping:
- 1 cup old-fashioned oats
- 1 cup California walnuts, roughly chopped
- 1/4 cup brown sugar, packed
- 2 tablespoons all-purpose flour
- 1 teaspoon ground ginger
- 1 teaspoon ground cinnamon
- 1/2 cup butter, melted
- Filling:
- 8 cups thinly sliced apples (Golden Delicious or Northern Spy)
- 1/2 cup sugar
- 2 tablespoons lemon juice
- 1 teaspoon ground ginger
- 1 teaspoon ground cinnamon
- 1 (9 inch) deep dish prepared pie crust
- In a medium bowl, use a fork to mix together oats, walnuts, brown sugar, flour, cinnamon and ginger. Drizzle with butter and combine to form a coarse crumb mixture. Set aside.
- In a large bowl, toss apples with sugar, lemon juice, cinnamon and ginger.
- Arrange apples in prepared piecrust. Sprinkle walnut streusel over top, completely covering the apples.
- Bake pie on a baking sheet, covered loosely with foil in centre of a 375 degrees F oven for 50 minutes. Remove foil and bake until streusel is golden and apples are tender, about 10 minutes more.
- Let sit 15 minutes before serving.