Spiced Pear Pie with Buckwheat Crumble

Crust: Preheat oven to 375°F. Roll out dough to a 13-inch round on a lightly floured surface. Transfer to a 9-inch deep-dish pie dish. Using kitchen shears or a paring knife, trim to a 1-inch overhang. Fold overhang under itself to form a rim; pinch between thumb and forefinger to make a uniform edge, then crimp with fingertips. Mark indentations with the tines of a fork for a more decorative edge, if desired. Refrigerate until firm, 30 minutes.

Line dough with parchment. Fill with dried beans or pie weights; bake until crust is firm and dry, about 25 minutes. Carefully remove beans and parchment; bake until golden on bottom, 5 to 10 minutes more. Transfer to a wire rack; let cool completely. (Cooled crust can be loosely covered with plastic wrap and stored at room temperature up to 1 day.)

Streusel topping: Whisk together both flours, sugar, salt, cinnamon, and cardamom in a bowl. Add butter and massage in with your fingers until thoroughly combined. Press topping into bottom of bowl; cover and refrigerate until firm, at least 1 hour and up to 3 days.

Filling: Place pears in a steamer basket set over a pot of simmering water. Cover and steam until tender but still holding their shape, 12 to 15 minutes. Transfer to a baking sheet; let cool to warm room temperature, about 15 minutes. In a large bowl, stir together flour, salt, sugar, cinnamon, lemon zest, and pepper. Stir in cane syrup, lemon juice, and ginger to form a loose paste. Add cooled pears and raisins, tossing to evenly coat. Transfer filling to crust, mounding mixture in center. Break topping into bite-size pieces and sprinkle evenly over filling.

Bake until filling is bubbly, pears are tender, and topping turns golden brown, 55 to 65 minutes. Transfer to wire rack; let cool completely, at least 4 hours or, loosely covered, up to 1 day.