I had to use a 9" square pan to get 9 graham cracker squares per layer. An 8" square pan would not work. Also, I only had enough custard to make 4 layers so I only needed 36 crackers instead of 45. I was a bit disappointed in the final outcome considering the prep work needed to complete the final recipe.
Key Lime Icebox Cake
Photo: Hector Sanchez; Styling: Heather Chadduck
Add the lime juice once you've fully cooked the custard to let the cornstarch thicken the mixture properly.
Yield: Makes 8 to 10 servings
- 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
- 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.
- 2. 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.)
- 3. 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.
- 4. Lift cake from pan, and place on a platter; discard plastic wrap. Cover loosely; let stand 1 hour.
- 5. 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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