We used a mix of heirloom apples (available at farmers' markets, orchards, and by mail-order), but feel free to substitute any firm, tart cooking apples.
Ingredients
1 large egg yolk
1 tablespoon cold unsalted butter, cut into 1/4-inch pieces
1 teaspoon ground cinnamon
1 vanilla bean, split and scraped, pod reserved for another use
1/2 cup granulated sugar
1/2 teaspoon salt
1/4 cup all-purpose flour, plus more for surface
2 tablespoons fresh lemon juice
2 tablespoons heavy cream
2 tablespoons sanding sugar
3 1/2 pounds (about 8) heirloom apples, such as Arkansas Black, Calville Blanc, Carpentin, Jonathan, Knobbed Russet, or Northern Spy
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