Lime Bars with Pistachio Graham Cracker Crust

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The perfect green St Patrick's Day recipe! Very similar to key lime pie but the pistachios add a nice flavor.

INGREDIENTS 
4 tablespoons (1/2 stick) unsalted butter, melted and cooled, plus more for pan 
2/3 cup shelled pistachios 
1 cup graham-cracker crumbs 
1/4 cup sugar 
1 tablespoons grated lime zest 
3 large egg yolks 
2 cans (300 mL/ea) sweetened condensed milk 
1 cup fresh lime juice 
For an extra tart taste you can add zest to the filling as well. 
Optional: Whipped Cream Topping 

DIRECTIONS
Preheat oven to 350 degrees. Brush an 8-inch square baking dish with melted butter. Line bottom with parchment paper, leaving a 2-inch overhang on two sides.

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. Using parchment paper overhang, lift out of pan, and transfer to a cutting board. With a serrated knife, cut into 16 squares, wiping knife with a damp kitchen towel between each cut.