
Lemon-Honey Tart with Salted Shortbread Crust
['Nonstick vegetable oil spray', '1 3/4 cups all-purpose flour', '2 tablespoons cornstarch', '1 1/4 teaspoons kosher salt', '3/4 cup (1 1/2 sticks) unsalted butter, room temperature, cut into 1" pieces', '2/3 cup powdered sugar', '1 Meyer lemon or thin-skinned regular lemon', '1 cup sugar', '3 tablespoons honey', '1 tablespoon finely grated lemon zest', '3 large eggs', '2 large egg yolks', '1/4 cup all-purpose flour', '2 teaspoons cornstarch', '1/4 teaspoon kosher salt', '2/3 cup fresh lemon juice, preferably Meyer lemon', 'A 9"-diameter springform pan']

Coat springform pan with nonstick spray. Whisk flour, cornstarch, and salt in a small bowl; set aside. Place butter and powdered sugar in a food processor. Pulse until mixture is smooth. Add dry ingredients to food processor and pulse until mixture resembles medium-size pebbles (dough will not come together completely). Transfer dough to prepared pan. Using your fingers, press dough evenly onto bottom and 1 1/2" up sides of pan. DO AHEAD: Crust can be prepared 1 day ahead. Cover and chill.
Using a mandoline, slice lemon into paper-thin rounds. Remove seeds. (If using a regular lemon, blanch slices in boiling water for 4 minutes, drain, and let cool before proceeding). Mix sugar, honey, and lemon zest in a medium bowl. Add lemon slices and toss to coat. Let sit until lemon is softened and sugar is dissolved, 30-45 minutes. DO AHEAD: Lemon slice mixture can be made 1 day ahead. Cover and chill.
Place rack in upper third of oven; preheat to 325°F. Bake crust until center is firm to the touch and edges are beginning to turn golden brown, 30-35 minutes.
When crust is almost done baking, whisk eggs and egg yolks in a medium bowl to blend. Whisk flour, cornstarch, and salt in a small bowl; add to egg mixture and whisk to combine. Whisk in lemon juice. Add lemon slice mixture; mix gently to combine.
Reduce oven temperature to 300°F. Pour filling into hot crust. Bake until filling is set and slightly puffed around edges, 25-30 minutes. Transfer pan to a wire rack; let cool completely. Chill for at least 4 hours, then unmold. Serve cold. DO AHEAD: Tart can be made 2 days ahead. Cover and keep chilled.
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