Napoleons
Ingredients:
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1 ½ (17.5 ounce) packages frozen puff pastry sheets, thawed
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¼ cup cornstarch
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4 cups milk, divided
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⅓ cup cake flour
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⅞ cup white sugar, divided
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3 eggs, separated
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1 tablespoon butter
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1 teaspoon vanilla extract
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1 (12 ounce) jar apricot jam
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3 cups sifted confectioners' sugar
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1 tablespoon lemon juice