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Whip egg yolks until ribbon stage.
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Whip up egg whites to soft peak.
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Add sugar slowly and whip to medium peak.
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Fold 1/3 of the egg white with few egg yolks mixture alternately with the dry ingredients (cornstarch and all-purpose flour).
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Prepare piping bag with #4 size tip. Fill up with the beaten egg white mixture and pipe out on wax paper to about 10 cm long.
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Sift powder sugar on top of the lady finger and bake for 15-20 minutes.