INGREDIENTS
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3/4 cup/175 ml extra-virgin olive oil, plus more for brushing
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5 eggs, separated
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3/4 cup/155 g sugar, more for sprinkling
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Zest and juice of 1 lemon
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Zest of 1 orange
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1 cup/125 g cake flour
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1/2 teaspoon salt
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9 ounces/250 g seedless red grapes, more to taste, optional