Chocolate Layer Cake with Caramel Swiss Meringue Buttercream Filling

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I always look forward to birthdays. Sometimes I wonder if I make friends solely for the fact that one day each year, I will have an excuse to bake something more elaborate than breads (posts coming soon!). I absolutely adore baking cakes and cupcakes, and I am a firm believer that everyone deserves a cake on their birthday. Not a cheap, plastic-y cake from the grocery store covered with neon coloured, sugary icing flowers (I actually just shuddered typing out that sentence). A real, homemade cake filled with good things. Like caramel Swiss meringue buttercream.

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When I first saw this recipe, I immediately bookmarked it and patiently waited for a birthday to come along. Caramel Swiss meringue buttercream? Are you kidding me?! Oh man. This cake is amazing.  Swiss meringue buttercream is slightly more complicated and takes a little bit more time to make than a plain buttercream, but the extra steps are so worth it. The resulting Swiss meringue buttercream is so much more buttery and silky. It will make you want to make a pillow out of the buttercream and rub it all over your face. But that’s just weird.

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Be careful when you’re making the caramel! I am slightly notorious for burning caramel, and usually have to make a second batch. As soon as your caramel turns a deep amber colour, take it off the heat. I usually have a second, clean bowl ready on the counter so that as soon as my caramel turns the right colour, I take the pan off of the heat and scrape the caramel into the bowl, to prevent the heat from the pan to further the cooking process.

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Lovely caramel Swiss meringue buttercream sandwiched between layers of heavenly, fluffy chocolate cake. The chocolate cake is made even better with the addition of coffee (to enhance flavour). Make a friend today, so you can bake this cake later :)

Chocolate Layer Cake with Caramel Swiss Meringue Buttercream Filling

Ingredients:
For the cake:
2¼ cups all-purpose flour
2¼ cups sugar
1 cup plus 2 tablespoons dark unsweetened cocoa powder
2¼ tsp. baking soda
1½ tsp. baking powder
1½ tsp. salt
6 tbsp. vegetable oil
1 cup plus 2 tbsp. buttermilk
1 cup plus 2 tbsp. brewed coffee
3 large eggs, at room temperature
1 tbsp. vanilla extract

For the filling:
1 cup sugar, divided
¼ cup water
¼ cup heavy cream
Generous pinch of sea salt, such as fleur de sel
4 large egg whites
1½ cup (3 sticks) unsalted butter, at room temperature

For the frosting:
12 oz. good quality semisweet or bittersweet chocolate, finely chopped
¼ cup unsweetened Dutch-process cocoa powder
¼ cup very hot water
1 cup plus 2 tbsp. (18 tbsp.) unsalted butter, at room temperature
1/3 cup plus 1 tbsp. confectioners’ sugar
Pinch of salt

Fleur de sel, for finishing

Directions:
To make the cake, preheat the oven to 350˚ F.  Grease and flour the edges of 3 8-inch baking pans, shaking out the excess.  Line the bottoms with rounds of parchment paper.  In the bowl of an electric mixer, combine the flour, sugar, cocoa powder, baking soda, baking powder, and salt.  Mix on low speed to blend.  Add the vegetable oil, buttermilk, coffee, eggs, and vanilla to the bowl and mix on low speed until well blended and completely incorporated.  Divide the batter evenly between the prepared pans.  Bake 20-25 minutes, or until a toothpick inserted in the center comes out clean.  Let the cakes cool in the pans about 15 minutes, then invert onto a wire rack and allow to cool completely.  Remove the parchment paper.

To make the caramel buttercream filling, place ½ cup plus 2 tablespoons of the sugar in a medium saucepan.  Mix in the water.  Bring the mixture to a boil over medium heat.  Stop stirring and let the caramel cook, gently swirling from time to time, until it is a deep amber color (test a drop on a white plate or bowl if necessary), watching it carefully to avoid burning.  Remove the mixture from the heat and slowly whisk in the cream and then the salt.  Set aside and let cool.

Combine the egg whites and the remaining ¼ cup plus 2 tablespoons sugar in a heatproof bowl set over a pot of simmering water.  Heat, whisking frequently, until the mixture reaches 160° F and the sugar has dissolved.  Transfer the mixture to the bowl of a stand mixer fitted with the whisk attachment.  Beat on medium-high speed until stiff peaks form and the mixture has cooled to room temperature, about 8 minutes.  (The bowl should be cool to the touch.)

Reduce the speed to medium and add the butter, 2 tablespoons at a time, adding more once each addition has been incorporated.  If the frosting looks soupy or curdled, continue to beat on medium-high speed until thick and smooth again, about 3-5 minutes more (or longer – don’t worry, it will come together!)  Blend in the cooled caramel until smooth and completely incorporated, scraping down the sides of the bowl as needed.

To make the frosting, place the chopped chocolate in a heatproof bowl set over a pan of simmering water.  Heat, stirring occasionally, until the chocolate is completely melted and smooth.  Set aside and let cool to room temperature.  In a small bowl, combine the cocoa powder and water and stir until smooth.  In the bowl of an electric mixer, combine the butter, confectioners’ sugar and salt.  Beat on medium-high speed until light and fluffy, about 5 minutes.  With the mixer on low speed, gradually blend in the melted and cooled chocolate until well incorporated.  Blend in the cocoa powder-water mixture until smooth.

To assemble the cake, level the cake layers if necessary.  Place one of the cake layers on a cake board or serving platter.  Top with half of the caramel buttercream and smooth in a thick, even layer.  Place a second cake layer on top and smooth the remaining caramel buttercream over that.  Place the final cake layer on top.  Cover the top and sides of the cake with the chocolate frosting and smooth with an offset spatula.  If desired, use additional frosting to pipe decorative accents on the cake.  Refrigerate until ready to serve.  Before serving, sprinkle with fleur de sel.

—SOURCE—
Annie’s Eats, adapted from Sweetapolita, filling and frosting originally from Martha Stewart

 

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3 Comments

  1. This caramel swiss buttercream sounds awesome!!

    Reply
  2. I am IN AWE of this cake and your frosting skills. My cakes are ALWAYS lopsided, messily frosted and just generally crappy looking, sadly. I really do try! But this. I want this. Triple layer chocolate cakes are my dream 🙂

    Reply
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