"It's absolutely foolproof...."
INGREDIENTS
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14 tablespoons (1 3/4 sticks) unsalted butter, at room temperature, plus more for coating the pan
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3 large eggs, at room temperature
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2 tablespoons coarse sugar such as turbinado, demerara, or raw
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2 1/2 cups cake flour
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1 1/2 teaspoons baking powder
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1/2 teaspoon baking soda
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1/2 teaspoon kosher salt
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1 1/2 cups granulated sugar
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1 vanilla bean (optional)
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2 to 5 teaspoons vanilla extract
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3/4 cup full-fat sour cream
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1 tablespoon finely grated orange zest
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1 tablespoon orange juice
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1 tablespoon unsalted butter, at room temperature
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1 cup powdered sugar
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2 tablespoons boiling water