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Bake the empty pie shell and remove from oven (usually bakes 7 minutes at 425 degrees).
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Lower oven temperature to 350 degrees.
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LEMON FILLING:.
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Mix cornstarch, flour, 1-1/4 cups sugar and salt in large saucepan.
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Add boiling water gradually and blend thoroughly. Cook, stirring constantly, for about 3 minutes at medium-high, until thick and clear.
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Beat egg yolks in small bowl.
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Add 1 Tbsp of the hot mixture to egg yolks and stir immediately and vigorously. Repeat 3 times. *This step keeps the eggs from cooking during the next step.
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Add egg yolk mixture to hot mixture in saucepan. Cook for 2 additional minutes, constantly stirring.
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Remove from heat. Slow stir in lemon juice, butter and lemon rind.
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Pour into cooled pie shell. Let cool.
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MERINGUE TOPPING:.
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Beat egg whites until stiff.
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Beat in 1/3 cup sugar, a little at a time. Continue beating until thick and smooth.
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Gently spoon onto cooled pie, pushing out to edges.
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Bake at 350 degrees for 12 - 15 minutes, until lightly browned.