INGREDIENTS
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2 cups cake flour
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1 teaspoon baking powder
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3/4 teaspoon baking soda
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1/2 teaspoon salt
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1/4 cup grapefruit juice
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1/2 cup full-fat plain yogurt
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1 stick unsalted butter, softened
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1 cup granulated sugar
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2 large eggs
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1 teaspoon finely grated lemon zest
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glaze
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3 tablespoons fresh lemon juice
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3 tablespoons granulated sugar
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1/2 cup confectioners' sugar
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2 tablespoons unsalted butter, softened