martha's key lime squares

How To Make martha's key lime squares

• Step 1
  CRUST: Lightly butter an 8-inch square baking pan. Line bottom and 2 sides of pan with parchment, leaving a 1-inch overhang; lightly butter the parchment.
• Step 2
  Combine the flour, brown sugar, and salt in a food processor, and pulse a few times to combine. Add butter and pulse until largest pieces are the size of peas. Add coconut and white chocolate and pulse a few more times, just until mixture holds together. Transfer mixture to pan, and pack down firmly with the bottom of a measuring cup. Bake in a preheated 400-degree oven until crust is deep golden brown, 18 to 20 minutes. Remove from oven and reduce heat to 300 degrees.
• Step 3
  FILLING: Whisk together eggs and granulated sugar in a bowl, then whisk in flour. Gently stir in lime juice (do not whisk or stir vigorously or batter will become foamy).
• Step 4
  Pour filling over hot crust, and bake until filling is set, about 15 minutes. Let cool completely on a wire rack.
• Step 5
  Run the tip of a knife along the 2 sides of the pan NOT lined with parchment overhang. Transfer to a cutting board, dust with confectioners' sugar, and cut into 1-inch squares. Bars can be stored in an airtight container at room temperature for 2 days.
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