Peach Crumble Slab Pie

• FOR THE CRUST:
• 2 1/2 cups/300 grams all-purpose flour, more as needed
• 3/4 teaspoon fine sea salt
• 2 1/2 sticks/285 grams cold unsalted butter, cubed
• 4 to 6 tablespoons ice water, as needed
• FOR THE FILLING:
• 6 pounds ripe peaches and/or nectarines, pitted and cut into 1 1/2-inch chunks
• 1 1/4 cups packed light brown sugar, more to taste
• 1/3 cup instant tapioca
• Zest of 3 lemons
• 3 tablespoons fresh lemon juice
• 1 1/2 teaspoons finely grated nutmeg
• 1 vanilla bean, split lengthwise and seeds scraped, or 1 teaspoon vanilla extract
• 1 teaspoon fine sea salt
• FOR THE CRUMBLE TOPPING:
• 1 1/2 cups/180 grams all-purpose flour
• 1 cup packed dark brown sugar
• 2 teaspoons ground cinnamon
• 1 1/2 teaspoons ground ginger
• 1/2 teaspoon fine sea salt
• 1 1/2 sticks/170 grams unsalted butter, cubed

1. FOR THE CRUST:
2. In a food processor, briefly pulse together flour and salt. Add butter and pulse until mixture forms chickpea-size pieces. Add ice water 1 tablespoon at a time and pulse until mixture is just moist enough to hold together. Form dough into a large ball. Wrap with plastic and flatten into a disk. Refrigerate at least 1 hour.
3. Using a lightly floured rolling pin, gently roll out dough to an 11-x-15-inch rectangle, dusting with flour if dough is sticking. Fold dough in half and transfer to a 9-x-13-inch baking dish. Carefully press crust into the bottom of the pan and completely up the edges so it's flush with the top of the pan (no need to crimp the dough). Return crust to refrigerator while you prepare the filling and crumble topping.
4. FOR THE FILLING:
5. In a large bowl, toss together peaches, sugar, tapioca, lemon zest and juice, nutmeg, vanilla and salt. Let stand 20 to 30 minutes. Taste and add a little more sugar if needed.
6. Meanwhile, heat oven to 425 degrees. Place a large rimmed baking sheet on the oven floor to preheat. Arrange one oven rack on the lowest position and a second rack in the center position.
7. FOR THE CRUMBLE TOPPING:
8. Whisk together flour, sugar, cinnamon, ginger and salt. Mix in butter with your fingertips until mixture is uniformly moist and comes together in large clumps.
9. Spoon filling into crust and top with crumble. Move baking sheet to the lowest rack and place pie on baking sheet. Bake 15 minutes. Reduce oven temperature to 375 degrees. Move baking sheet with pie to the center rack. Continue baking until pie is golden brown and filling is bubbling, about 1 hour. Transfer to a wire rack to cool completely before slicing.

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Taken from www.epicurious.com/recipes/member/views/peach-crumble-slab-pie-52882541 (may not work)