INGREDIENTS
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3 eggs, separated
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100 grams (1/2 cup) granulated sugar, divided
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a pinch of salt
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1 teaspoon vanilla extract
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2 teaspoons freshly squeezed lemon juice, divided
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the zest of 1 lemon, grated
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65 grams (1/2 cup) cake flour, sifted
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30 grams (2 tablespoons) potato starch
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Icing sugar (powdered sugar) for dusting