INGREDIENTS
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Unsalted butter, room temperature, for pans
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3 cups all-purpose flour, plus more for pans
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3 cups granulated sugar
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1 1/2 cups unsweetened Dutch-process cocoa powder
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1 tablepoon baking soda
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1 1/2 teaspoons baking powder
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Coarse salt
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4 large eggs
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1 1/2 cups low-fat buttermilk
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1/2 cup plus 2 tablespoons safflower oil
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2 teaspoons pure vanilla extract
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For the Caramel
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4 cups granulated sugar
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1/4 cup light corn syrup
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2 cups heavy cream
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Coarse salt
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2 sticks cold unsalted butter, cut into tablespoons