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Lemon Bars

Makes 16

The warm filling must be added to a warm crust. Start preparing the filling when the crust goes into the oven. Be sure to cool the bars completely before cutting them.

Crust:
1 1/4 cups (6 1/4 ounces) unbleached all-purpose flour
1/2 cup (2 ounces) confectioners’ sugar, plus more to decorate the finished bars
1/2 teaspoon salt
8 tablespoons (1 stick) unsalted butter, softened but still cool, cut into 1-inch pieces

Lemon Filling:
7 large egg yolks, plus 2 large eggs
1 cup granulated sugar
2/3 cup juice from 4 or 5 medium lemons, plus 1/4 cup finely grated zest
Pinch salt
4 tablespoons (1/2 stick) unsalted butter, cut into 4 pieces
3 tablespoons heavy cream

For the crust: Spray a 9-inch square baking pan with nonstick cooking spray. Fold two 16-inch pieces of foil or parchment paper lengthwise to measure 9 inches wide. Fit 1 sheet in the bottom of the greased pan, pushing it into the corners and up the sides of the pan (overhang will help in removal of baked bars). Fit the second sheet in the pan in the same manner, perpendicular to the first sheet. Spray the sheets with nonstick cooking spray.

Place the flour, confectioners’ sugar, and salt in a food processor and process briefly. Add the butter and process to blend, 8 to 10 seconds, then process until the mixture is pale yellow and resembles coarse meal, about three 1-second pulses. Sprinkle the mixture into the prepared pan and press firmly with your fingers into an even layer over the entire pan bottom. Refrigerate for 30 minutes.

Adjust an oven rack to the middle position and heat the oven to 350 degrees. Bake the crust until golden brown, about 20 minutes.

For the filling: In a medium nonreactive bowl, whisk together the yolks and whole eggs until combined, about 5 seconds. Add the granulated sugar and whisk until just combined, about 5 seconds. Add the lemon juice, zest, and salt; whisk until combined, about 5 seconds. Transfer the mixture to a medium nonreactive saucepan, add the butter pieces, and cook over medium-low heat, stirring constantly with a wooden spoon, until the curd thickens to a thin sauce-like consistency and registers 170 degrees on an instant- read thermometer, about 5 minutes. Immediately pour the curd through a single-mesh stainless steel strainer set over a clean nonreactive bowl. Stir in the heavy cream; pour the curd into the warm crust immediately.

Bake until the filling is shiny and opaque and the center 3 inches jiggle slightly when shaken, 10 to 15 minutes. Cool on a wire rack to room temperature, about 45 minutes. Remove the bars from the pan using the foil or parchment handles and transfer to a cutting board. Cut into 2-inch squares, wiping the knife clean between cuts as necessary Sieve confectioners’ sugar over the bars, if desired.

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