FOR THE DOUGH
1 1⁄2 cups all-purpose flour
1 tablespoon granulated sugar
1⁄2 teaspoon kosher salt
1 stick unsalted butter, frozen and cut into small pieces
1 tablespoon apple cider vinegar
1⁄4 cup ice water
1 large egg, beaten, for egg wash
Turbinado sugar, for sprinkling
FOR THE FILLING
1/3 cup sugar
2 tablespoons lemon zest
1⁄4 teaspoon cinnamon
1 tablespoon zested or minced fresh ginger
1 tablespoon fresh lemon juice
1 vanilla bean, cut lengthwise, seeds scraped and pod reserved for another use (or 3 teaspoons vanilla extract)
4 Pears, halved, cored, and thinly sliced