INGREDIENTS
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4 large eggs (separated), at room temperature
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3 1/2 cups (420 g/14.5 oz) sifted cake flour
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4 teaspoons (20 g) baking powder
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1/2 (3 g) teaspoon salt
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1 cup (227 g/2 sticks/8 oz) unsalted butter, at room temperature
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2 cups (400 g/14 oz) granulated sugar, divided
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2 teaspoons (10 mL) pure vanilla extract
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1 cup (250 mL) milk, at room temperature
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1/4 teaspoon (1.25 mL) cream of tartar
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1 cup (227 g/2 sticks/8 oz) unsalted butter, softened
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6 cups (750 g/1 lb + 10 oz) icing sugar (confectioners')
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1/2 cup (125 ml) whipping cream (35%)
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2 tablespoons (30 mL) pure vanilla extract
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1 tablespoon (15 mL) water
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a pinch of salt
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