Custard Pecan Pie

Name: Custard Pecan Pie
Ingredients: 1 ¼ cups all-purpose flour; 1 cup whole-wheat pastry flour; ¼ teaspoon salt; 12 tablespoons (1 1/2 sticks) cold unsalted butter, cut into chunks; ½ cup reduced-fat plain Greek yogurt; 4 tablespoons ice water; 3 large eggs, divided; 1 tablespoon all-purpose flour; 4 tablespoons (1/2 stick) unsalted butter, melted and cooled; ½ cup buttermilk; ½ cup packed light brown sugar; ¼ cup cane syrup or dark corn syrup; 1 teaspoon vanilla extract; 1 ¾ cups pecan halves, chopped