INGREDIENTS
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1/2 teaspoon kosher salt
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1 cup cake flour
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1 1/2 cups egg whites, room temperature (from about 10 large eggs; do not use boxed or powdered egg whites)
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1 teaspoon cream of tartar
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2 teaspoons fresh lemon juice
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1 1/2 cups granulated white sugar
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1/2 teaspoon pure orange extract
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1 vanilla bean, scraped OR 1/2 teaspoon vanilla bean paste