1 1/2 cups flour
1/2 cup confectioners’ sugar
12 tablespoons cold unsalted, butter, cut into 1/2-inch pieces
6 large eggs
3 cups granulated sugar
1 cup + 2 tablespoons freshly squeezed lemon juice
1/2 cup flour
To make the crust: Preheat oven to 325 degrees. Combine flour and confectioners’ sugar in the bowl of a stand mixer fitted with the paddle attachment and beat on low speed until mixed. Add butter and continue to mix until butter is the size of small peas, about 30 seconds. The mixture will be very dry. Gently press mixture evenly onto the bottom of a 9-by-13-inch baking pan.
Bake until golden brown, 20 to 25 minutes. Let cool to room temperature. Reduce oven temperature to 300 degrees.
To make filling: In a large bowl, whisk together eggs and granulated sugar until smooth. Stir in lemon juice and then the flour. Pour filling on top of crust.
Bake until lemon filling is set, about 30-40 minutes. Let cool to room temperature and then put in the refrigerator for 1 hour or keep at room temperature for 3 hours before cutting. Cut into squares measuring about 2 1/4 inches and dust the tops with confectioners’ sugar.