INGREDIENTS
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6 large eggs
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2 1/4 cups (225 grams) sifted cake flour
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1 1/2 cups (300 grams) superfine white sugar (caster sugar) (*See Note)
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1 tablespoon baking powder
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1/2 teaspoon salt
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2 tablespoons grated orange zest (outer orange skin)
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1/2 cup (120 ml) vegetable, corn, canola, or safflower oil
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3/4 cup (180 ml) freshly squeezed orange juice
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1 teaspoon pure vanilla extract
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1/2 teaspoon cream of tartar (optional)