Lime Squares with Pistachio & Graham Cracker Crust

I made these last night for Hubby's office. These are easy and delicious - another great Martha Stewart recipe. It's kind of like key lime pie in a bar - but a little lighter. They also are not "too" sweet. The pistachio graham cracker crust is delightful and provides an extra crunch and a tad bit of saltiness that works great with the lime filling.

Lime Squares with Pistachio Graham Cracker Crust

FOR THE CRUST
4 tbsp (1/2 stick) unsalted butter, melted and cooled
2/3 cup shelled pistachios
1 cup graham-cracker crumbs
1/4 cup sugar
1 tbsp grated lime zest

FOR THE FILLING
2 large egg yolks
1 can (14 oz) sweetened condensed milk
1/2 cup fresh lime juice (3 limes did the trick)

Preheat oven to 350 degrees. Coat 8-inch square baking dish with cooking spray.

In a food processor, finely grind pistachios with graham-cracker crumbs, sugar, and zest. Blend in butter. Press mixture into bottom and 1 inch up sides of prepared pan. Bake until lightly browned, 8 to 12 minutes. Cool crust, 30 minutes.

To make the filling: In a large bowl, whisk together egg yolks and condensed milk. Add lime juice; whisk until smooth. Pour filling into cooled crust; carefully spread to edges.

Bake until set, about 15 minutes. Cool in pan on rack; then chill at least 1 hour before serving.

With a serrated knife, cut into 16 squares, wiping knife with a damp kitchen towel between each cut. Keep refrigerated.