INGREDIENTS
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For the Cake
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1 cup unsweetened cocoa powder
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4 ounces semisweet chocolate, chopped
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1 rounded Tablespoon espresso powder
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1 cup hot water
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3/4 cup buttermilk
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1 1/2 teaspoons pure vanilla extract
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2 cups cake flour
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1 teaspoon baking powder
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1 teaspoon baking soda
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1 teaspoon kosher salt
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2 cups granulated sugar
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1 cup (8-ounces) unsalted butter, at room temperature
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3 extra large eggs, at room temperature
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For the Caramel Ganache
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9 1/2 ounces semisweet chocolate
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1 1/8 teaspoon kosher salt
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1 cup granulated sugar
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1/4 cup water
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1 1/2 cups heavy cream
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1 teaspoon pure vanilla extract
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For the Filling and Assembly
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2 Tablespoons cold water
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1 package of unflavored gelatin
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1 1/2 cups heavy cream, chilled
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1/2 cup confectioners' sugar
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1 vanilla bean, split lengthwise
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Flaky sea salt (such as Maldon)