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Key Lime Ice Box Cake

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Ingredients

  • 3/4 cup granulated sugar
  • 1/4 cup cornstarch
  • 1/8 teaspoon kosher salt
  • 4 large egg yolks
  • 2 cups half-and-half
  • 3 tablespoons butter
  • 2 tablespoons Key lime zest*
  • 1/2 cup fresh Key lime juice*
  • 45 graham cracker squares
  • 1 cup whipping cream
  • 1/4 cup powdered sugar

Details

Preparation

Step 1

Whisk together first 3 ingredients in a heavy saucepan.

Whisk together egg yolks and half-and-half in a bowl. Gradually whisk egg mixture into sugar mixture; bring to a boil over medium heat, whisking constantly. Boil, whisking constantly, 1 minute; remove from heat.

Whisk in butter and zest until butter melts. Gradually whisk in juice just until blended. Pour into a metal bowl, and place bowl on ice. Let stand, stirring occasionally, 8 to 10 minutes or until custard is cold and slightly thickened.

Meanwhile, line bottom and sides of an 8-inch square pan with plastic wrap, allowing 4 inches to extend over sides. Place 9 graham crackers, with sides touching, in a single layer in bottom of pan to form a large square. (Crackers will not completely cover bottom.)

Spoon about 3/4 cup cold custard over crackers; spread to edge of crackers. Repeat layers 3 times with crackers and remaining custard, ending with custard; top with remaining 9 crackers. Pull sides of plastic wrap tightly over cake; freeze in pan 8 hours.

Lift cake from pan, and place on a platter; discard plastic wrap. Cover loosely; let stand 1 hour.

Beat whipping cream at high speed with an electric mixer until foamy; gradually add powdered sugar, beating until soft peaks form. Spread on top of cake.

*Regular (Persian) lime zest and juice may be substituted.

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