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If you have a food processor, use it to combine 2 cups flour, confectioner's sugar, butter, shredded coconut and chopped macadamia nuts.
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If you don't have a food processor, combine the 2 cups flour, confectioner's sugar,butter, shredded coconut and chopped macadamia nuts in a large bowl. Use two knives to cut and mix the ingredients until the mixture is in little bits about the size of small peas.
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Grease a 13 x 9 baking pan and press the flour mixture in an even layer in the bottom of the pan. Bake for 20 minutes at 350 degrees F until browned.
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Remove from oven and let this crust stand and cool for at least 10 minutes.
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In a second bowl, mix the granulated sugar, lime juice, 1/4 cup flour, baking powder and eggs until the mixture is smooth. Pour ino the baked crust. Bake for 20 minutes at 350 degrees F until the filling is set.
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Allow to cool and cut into 3" x 3" bars. To serve, dust with a little confectioner's sugar.