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Stir everything together in a saucepan until almost boiling. Kahlúa, or use a coffee-flavored syrup like Torani Use 10 ounces for the bottom layer, 10 ounces for the middle layer, and the rest for the top layer. Chill again, then cut into small rectangles for service. This will act as a crumb coat. Chill until the cake is firm, then melt an amount of ganache for the top, spreading or tilting to make an even layer. Spread the buttercream over the second joconde evenly, and press the last joconde down evenly to get a perfectly flat cake. Use the last of the syrup for this layer, and spread a very thin layer of ganache over the top. Douse this layer of joconde with 10 ounces of coffee syrup, again making sure all the syrup is used up. Place the second joconde over the ganache and gently press to make sure the layer is evenly flat. Evenly spread the ganache over the top of the biscuit joconde. Brush 10 ounces of coffee syrup over the top, ensuring all the syrup is used up. Trim 3 biscuits joconde to fit inside the frame. Lay a ganache frame or rectangular stainless steel frame over parchment paper or a silicone sheet on a flat sheet pan.
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It is then topped with melted ganache that sets up shiny and smooth. This cake has three layers of joconde separated by a thin layer of ganache and a thicker layer of coffee buttercream.
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Here is my favorite recipe for Opéra Cake, and it’s very simple. You will often find flakes of edible gold leaf, gold dust, a piping of a musical note, or a coffee bean on the top. The topping for it is generally a smooth chocolate glaze.
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Depending on where you find the dessert, you’ll find variations ranging from several layers of joconde with the buttercream and ganache, to just a few. Opéra Cake consists of thin layers of joconde moistened with a coffee-flavored syrup, and sandwiched between layers of coffee-flavored buttercream and ganache. Others say it was invented in the kitchens of Dalloyau, where it is still showcased today. Some say Opéra Cake is credited to Gaston Lenôtre (1920 – 2009), who started École Lenôtre in 1971. For the kids, if they enjoy chocolate, they’ll love a little Opéra Cake at tea time. It is sinfully rich and since it is typically served in small portions, the whole presentation makes it a little sexy for adults – you know you’re getting something good inside a small package. To me, there is nothing more close-your-eyes decadent than an Opéra Cake, probably because I know what goes into it. Opéra Cake – courtesy Flickr User arnold | inuaki
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