Whole-Lemon Tart

Step 1

Center a rack in the oven, and heat it to 325 degrees. Place the crust on a baking sheet lined with parchment paper.

Step 2

Cut the lemon into thin slices, and discard the seeds. Toss the slices and sugar into the bowl of a food processor, and whir for 3 minutes, scraping the bowl as needed, until smooth. With the machine running, add the eggs, one at a time, and then, when they’re incorporated, the cornstarch followed by the melted butter. Remove the bowl, and rap it against the counter a few times to pop some of the bubbles in the mixture. Pour the batter into the crust.

Step 3

Bake the tart for 45 to 55 minutes, until the filling is puffed and lightly browned — don’t be concerned if the top cracks. If you tap the side of the pan, the filling should seem firm; if it jiggles just the least bit in the center, that’s fine. A toothpick poked into the center — be gentle — will come out clean. Transfer the tart on the baking sheet to a cooling rack. Leave until it reaches room temperature. The tart can be served now or chilled (it will keep in the refrigerator overnight).

Step 4

Just before serving, dust the top with confectioners’ sugar.