Lemon Raspberry Squares 
Source: Williams Sonoma

Ingredients
1 3/4 cups + 1/3 cup flour
1/2 cup powdered sugar
1/2 tablespoon salt
1 cup chilled unsalted butter, cut up small
1 teaspoon ice water, if needed
1 cup jam (raspberry or sour cherry)
2 cups sugar
2 teaspoons grated lemon zest
4 eggs, beaten
3/4 cup lemon juice


Method:
Preheat an oven to 350ºF. Butter a 9-by-13-inch baking pan. Place the 1 3/4 cups flour, 1/2 cup confectioners sugar and salt in a food processor and pulse to blend. Add the butter and process until the dough begins to form a ball, adding the ice water if necessary. Press the dough evenly over the bottom of the prepared baking pan. Bake until the crust is lightly golden, about 20 minutes. Let cool for at least 30 minutes, then evenly spread the jam over the crust.

In a bowl, whisk together the granulated sugar, the remaining 1/3 cup flour and the lemon zest. Place the eggs in a large bowl and slowly add the flour mixture, beating with an electric mixer until well blended, 1 to 2 minutes. Add the lemon juice and mix to combine. Pour the lemon mixture carefully over the raspberry jam layer, making sure to keep layers separate. Bake until the lemon topping is just set, 25 to 30 minutes. Let cool in the pan. Dust with confectioners sugar and cut into squares with a serrated knife. Place in a covered container and keep cool until ready to serve. Makes 24 squares.