"Chocolate sponge cake rolled around cream filling, frosted with whipped chocolate ganache...."
INGREDIENTS
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1 cup (170g) semisweet chocolate wafers chopped
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3/4 cup (170g) heavy cream
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1/8 teaspoon table salt
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1 teaspoon King Arthur Pure Vanilla Extract
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6 tablespoons (85g) unsalted butter at room temperature
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5 large eggs at room temperature
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1/2 cup (99g) granulated sugar
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1/2 teaspoon table salt
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1 teaspoon King Arthur Pure Vanilla Extract
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1/2 cup (60g) King Arthur Unbleached All-Purpose Flour
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1/3 cup (28g) Dutch-process cocoa
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3 tablespoons (21g) cornstarch
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1 teaspoon espresso powder optional
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1 teaspoon baking powder
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1/4 cup (50g) vegetable oil
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6 tablespoons (85g) buttermilk at room temperature
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1 cup (227g) heavy cream
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2 teaspoons King Arthur Pure Vanilla Extract
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2 tablespoons (17g) granulated sugar divided
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1 teaspoon Instant ClearJel
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3/4 cup (170g) mascarpone cheese at room temperature