dad's favorite - don't touch! - lemon squares

How To Make dad's favorite - don't touch! - lemon squares

• Step 1
  Preheat the oven to 350 degrees. Line a 9-inch square pan with foil, then coat lightly with "Pam". If you are going to serve the squares directly from the pan, there is no need to line with foil.
• Step 2
  Process the flour, powdered sugar, and salt in a food processor until combined, about 3 seconds. Sprinkle the 8 tablespoons of butter over the top and pulse until the mixture is pale yellow and resembles coarse crumbs, about 8 pulses.
• Step 3
  Sprinkle the mixture in the prepared pan and press firmly into an even layer, using your fingers. Bake until the crust starts to brown, about 20 minutes.
• Step 4
  While the crust is baking, whisk the yolks, and whole eggs together in a medium nonreactive saucepan. Whisk in the sugar until combined, then whisk in the lemon juice, lemon zest, and a pinch of salt. Add the 4 tablespoons of butter and cook over medium-low heat, stirring constantly, until the mixture thickens slightly and registers 170 degrees on an instant read thermometer, about 5 minutes.
• Step 5
  Strain the mixture immediately into a nonreactive bowl and stir in the cream. Pour the warm lemon curd over the hot crust (it is important that both the lemon curd and crust are hot - this ensures that the filling cooks through evenly). Bake until the filling is shiny and opaque and the center jiggles slightly when shaken, 10 to 15 minutes.
• Step 6
  Let cool completely on a wire rack, about 2 hours, before removing the squares from the pan using the foil and cutting into 9 squares (smaller if you like). Dust with powdered sugar before serving.
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