INGREDIENTS
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For the Cake
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½ cup dutch-process cocoa powder
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½ cup + 1 cup water, divided
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1 ½ sticks (6 ounces) unsalted butter, softened
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1 cup granulated sugar
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¼ cup brown sugar, firmly packed
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3 large eggs, room temperature
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2 teaspoons vanilla extract
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2 cups (7 ounces) sifted cake flour
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¼ cup (1 ¼ ounces) all-purpose flour
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2 teaspoons baking powder
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¼ teaspoon salt
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For the Filling
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⅓ cup heavy whipping cream
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1 teaspoon sugar
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½ teaspoon vanilla extract
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For the Glaze
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8 ounces dark chocolate*, finely chopped
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1 cup heavy whipping cream
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Optional: Fleur de Sel, for sprinkling