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Preheat oven to 350 degrees F.
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Coat two 9 by 2-inch cake pans with butter and coat each with 1 Tablespoon sugar.
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-------------For the cake--------------.
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In a large mixing bowl of a standing mixer, fitted with whisk attachment, combine eggs and 1 cup of sugar.
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Beat on medium-high speed until the mixture is pale yellow, thick, and has tripled in volume, about 8 minutes.
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In a separate mixing bowl sift together the cocoa, flour, and baking powder.
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Fold cocoa mixture into the egg mixture to combine completely, until mixture is smooth.
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Divide cake batter evenly into two cake pans.
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Bake for 25 minutes, or until cake springs back when touched.
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Cool cakes for 15 minutes.
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Loosen cakes from pans and unmold onto wire rack.
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Cool to room temperature.
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-------------For the pudding-------------------.
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Combine 1/2 cup of the cream with the cornstarch in a small bowl and stir to make a paste.
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Combine the paste with remaining 3 1/2 cups cream, sugar, chocolate chips, and vanilla in a large nonstick saucepan.
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Using a wire whisk, stir the mixture until it is well blended.
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Over low heat, whisk cream mixture until chocolate melts thoroughly.
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Cook the mixture, stirring frequently, until it becomes very thick, about 25 minutes.
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Pour pudding into a large bowl.
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Cover with plastic wrap, covering surface of pudding with the plastic to prevent a skin from forming.
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Let cool to room temperature.
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----------------To assemble the cake----------------.
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Line a baking sheet with parchment paper and place a wire rack over it.
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Using a serrated knife, cut each cake in half horizontally.
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Brush the tops of three layers each with 1/4 cup of the Grand Marnier.
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Place the bottom layer on a 9-inch round of cardboard and set it on the wire rack.
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Spread 1 1/2 cups of the pudding evenly on top of the layer.
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Top with a second layer of cake.
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Spread 1 1/2 cups of pudding evenly over it.
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Repeat for the third layer.
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Top with the fourth layer.
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Chill in the refridgerator for 2 hours.
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----------------For the ganache-------------.
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In a medium-sized nonstick saucepan over medium heat, heat cream just under boiling point.
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Remove from heat and add chopped chocolate.
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With a whisk, stir until chocolate is completely melted and mixture is smooth.
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Pour ganache over the top of chilled cake, allowing overflow to drip down the sides.
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Cool slightly.
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Carefully remove the cake from the wire rack.
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Chill for at least 6 hours.
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-----------For the garnish-------------.
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In a medium-sized saucepan, add 3-inches of water.
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Boil water and reduce to a simmer.
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Place semisweet chips in a stainless steel bowl and place bowl over simmering water.
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Stir chocolate until melted to a smooth consistency.
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Line a baking sheet with parchment paper and spread melted chocolate evenly across sheet.
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Chill in refrigerator until set, about 1 hour.
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Break the chocolate into large shard-like pieces.
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Place chocolate shards on top of the cake vertically at various angles.
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Sprinkle with confectioners' sugar.