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["Preheat oven to 350 degrees Fahrenheit.", "Lightly grease a 13""x9"" baking pan; set aside.", "In a food processor, blend confectioners' sugar, 2 cups flour and salt.", "Add butter and pulse until the mixture is crumbly.", "Press into baking pan and bake for 20 minutes.", "Remove from oven.", "Meanwhile beat the eggs, 2 cups sugar, 6 teaspoons flour and lemon juice until well combined.", "Stir in lemon rind.", "Pour this mixture on top of baked mixture; bake an additional 25 minutes.", "Cool completely and sprinkle with sifted confectioners' (powdered) sugar.", "Cut into squares."]