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Tart Key Lime Squares

Source of Recipe

From "Cookies, Brownies, and Bars" by Elinor Klivans


Recipe Introduction

"For a new twist on a classic bar cookie, try the unique flavor of Key limes instead of lemons. The skin of these small, round limes found in specialty-food stores is an attractive greenish-yellow."

List of Ingredients

For the crust:
â—¦ 1 ½ cups all-purpose flour
â—¦ ½ cup confectioners' sugar
â—¦ 1 ½ teaspoons grated Key lime zest
â—¦ â…› teaspoon salt
â—¦ ¾ cup cold unsalted butter, cut into ½-inch pieces

For the filling:
â—¦ 6 large eggs
â—¦ 2 ½ cups granulated sugar
â—¦ ¾ cup fresh Key lime juice
â—¦ 1 tablespoon grated Key lime zest
â—¦ ½ cup all-purpose flour


Recipe

Position a rack in the middle of the oven and preheat to 325° F. Press a 20-inch piece of aluminum foil onto the bottom and over the sides of a 13 by 9 by 2-inch baking pan. Butter the foil.

To make the crust, in a large bowl, combine the flour, confectioners' sugar, zest, and salt. Using a mixer on low speed, beat just to blend the ingredients, about 1 minute. Add the butter pieces and beat until the largest pieces are about the size of peas, about 2 minutes. Firmly and evenly press the dough over the bottom and 1 inch up the sides of the prepared pan. Bake just until the edges are lightly browned, about 20 minutes. Remove from the oven and set aside. Reduce the oven temperature to 300° F.

To make the filling, in a large bowl, whisk the eggs just until blended. Add the granulated sugar and lime juice and zest and whisk until smooth, about 1 minute. Sift the flour into the bowl and whisk until incorporated. Slowly pour the filling over the crust. Bake until the filling looks set and does not wobble when the pan is shaken, 40 to 45 minutes. Transfer the pan to a wire rack and let cool until the top is room temperature, about 1 hour. Cover the pan with plastic wrap and refrigerate for at least 4 hours to firm.

Holding the ends of the foil, lift the bar onto a cutting surface. Using a large, sharp knife, cut the bar into 48 pieces. Store the squares in an airtight container in the refrigerator for up to 2 days.

Makes 48 squares