INGREDIENTS
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1/4 cup (57 grams) unsalted butter, cold, cubed, plus more for the pan
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3 cups (384 grams) all-purpose flour, plus more for the pan
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2 cups (400 grams) granulated sugar
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1 tablespoon baking powder
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1 1/2 teaspoons kosher salt
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1/4 teaspoon ground turmeric
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3/4 cup (145 grams) canola oil
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4 1/2 teaspoons vanilla extract
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2 large eggs
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2 large egg yolks
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2 cups (467 grams) buttermilk, room temperature
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3/4 cup (170 grams) unsalted butter, melted and cooled slightly
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1 cup (85 grams) natural cocoa powder
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1 1/2 teaspoons vanilla extract
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3/4 teaspoon kosher salt
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4 1/2 cups (513 grams) powdered sugar
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1/2 cup strong, cold coffee, plus more as needed