Orange Bars with Sesame Crust

Name: Orange Bars with Sesame Crust
Ingredients: Nonstick cooking spray, for the pan; 1 3/4 cups (228 grams) all-purpose flour; 1/2 cup (100 grams) granulated sugar; 1/4 cup (32 grams) cornstarch; 2 teaspoons orange or mandarin zest; 1/4 teaspoon kosher salt; 2 sticks (1 cup/226 grams) cold, unsalted butter, diced; 1/4 cup (40 grams) toasted white sesame seeds; 1 1/2 cups (300 grams) granulated sugar; 2 teaspoons orange or mandarin zest plus 3/4 cup (192 grams) freshly squeezed juice; 6 tablespoons (49 grams) all-purpose flour; 6 large eggs; 1/4 cup (64 grams) freshly squeezed lemon juice; Confectioner’s sugar, for dusting