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Beat egg yolks until thicken and lemon colored.
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Gradually add 1/3 cup of the granulated sugar, the lemon juice and the lemon zest.
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Beat egg whites until almost stiff then gradually beat in the remaining 1/3 cup sugar.
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Beat until stiff peaks form.
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Fold yolk mixture into whites.
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Sift dry ingredients into a separate container.
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Add to egg mixture, folding in carefully.
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Fold in melted butter.
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Pour batter into waxed paper-lined 10x15x1-inch jelly roll pan.
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Bake at 375° for 12 minutes.
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Sprinkle with confectioners' sugar.
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Turn onto a clean kitchen towel which has been generously dusted with confectioners' sugar.
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Trim edges, if necessary.
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Roll cake up, towel and all, while still warm.
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Let cool completely.
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Unroll and fill with whipped cream or ice cream then re-roll cake.