INGREDIENTS
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3 cups sifted cake flour (not self-rising; sift before measuring)
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2 teaspoons baking powder
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1 teaspoon baking soda
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1/2 teaspoon salt
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1 cup unsalted butter, softened
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2 cups granulated sugar
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2 teaspoons pure vanilla extract
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grated zest of 1 grapefruit
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3 large eggs, room temperature
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2 cups well-stirred, plain whole-milk yogurt (not Greek-style) at room temperature 30 minutes
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1 Tablespoon creamy honey
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2 Tablespoons light corn syrup
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1/2 cup heavy cream
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1/2 teaspoon pure vanilla extract
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3 cups confectioner's sugar