INGREDIENTS
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1 cup boiling hot coffee
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1 cup unsweetened cocoa powder (natural or dutch process, I used half and half)
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2 1/2 cups all-purpose flour
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1 cup sugar
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1 1/2 teaspoons baking powder
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1 teaspoon baking soda
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1 teaspoon salt
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3 large eggs, at room temperature
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3/4 cup vegetable oil
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1/2 cup greek yogurt
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2 teaspoons vanilla extract
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1/2 cup buttermilk
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For the filling:
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1 cup milk (I used 2%)
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1/3 cup sugar
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2 tablespoons cornstarch
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1 teaspoon vanilla extract
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1 large egg
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2 ounces semisweet chocolate, finely chopped
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ganache:
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12 ounces semisweet chocolate, finely chopped
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Pinch of salt
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1 1/2 cups plus 2 tablespoons heavy cream