INGREDIENTS
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1 cup buttermilk
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1/2 cup finely ground polenta or cornmeal
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1 cup unsalted butter, room temperature
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1 1/4 cups sugar
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4 large eggs
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1 tablespoon grated lemon zest
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1 vanilla bean
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2 1/4 cups unbleached all-purpose flour
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2 teaspoons baking powder
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3/4 teaspoon baking soda
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1/4 teaspoon salt
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Lemon Caramel Sauce (recipe follows)
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2 cups sugar
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4 tablespoons butter
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6 tablespoons water
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12 tablespoons freshly squeezed lemon juice, plus zest
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1 vanilla bean, split