chocolate layer cake with swiss buttercream frosting

chocolate genoise layer cake with raspberry swiss buttercream frosting

Genoise cakes are one of my all time favorites when it comes to baking a fancy dessert cake especially those that get iced. They don't crack and rise evenly without any crazy issues and there is something magical about the sponge texture of these cakes. More than anything, it has taught me patience, something I always need help with. 

genoise cakes

This weekend we celebrated our friends' upcoming marriage with a stock-the-bar party. They both love chocolate, so I figured it might be fun to make them a chocolate cake with a hint of raspberry. The cake itself is light and the Swiss buttercream frosting is not too sweet making it a good choice for a brunch dessert. this way the possibility of food-induced coma is reduced.

frosting the cake

I prefer to make two separate cakes here rather than do it all in one sitting. It is easier to fold less flour into the egg mixture and the risk of deflating the eggs gets reduced. I topped the frosting with a few shavings of sweet dark chocolate to balance the flavor of the frosting and give it a little richer look. You can leave the food color out or adjust the amount you need to get the desired level of color you like.

chocolate genoise layer cake

Both the cake and buttercream frosting recipes have been modified and adapted from "Great Cakes" by Carole Walter. 

layer cake

Note: Prepare two genoise cakes separately. Instead of doubling the amount of ingredients required for the cakes, I find it easier to prepare two separate cakes especially when it comes to the folding of the dry ingredients into the batter.

chocolate genoise cake 

yields: 10 1/2" X 15 1/2' X 1" thick cake 

ingredients

3/4 cup ( 3 3/4 ounces) cake flour
1/3 cup (7/8 ounce) dutch-process cocoa
1/8 teaspoon baking soda
5 large whole eggs + 2 large egg yolks
3/4 cup+2 tablespoons (6 1/4 ounces) sugar 
2 teaspoons vanilla extract
1/4 cup (1 7/8 ounces) butter, melted and warm

1. Place a rack in the middle of the oven and preheat to 350F.  Line a baking pan with parchment paper. 
2. Sift the cake flour, cocoa and baking soda together 4 times and place aside.
3. Place the bowl of an electric mixer over a saucepan containing simmering water. The water must not touch the base of the bowl. Add the eggs and yolks with the sugar and whisk to blend completely. This will take about 4 minutes until the sugar is completely dissolved and the color of the mixture becomes a dark gold. 
4. Remove the bowl from the saucepan and using the whisk attachment, whip the eggs for 5-6 minutes until tripled in volume and the mix becomes light and foamy. At this point, you should able to draw a ribbon that will hold its shape on the foam. 
5. Add the vanilla from the side of the bowl and whip for another 2 minutes. 
6. Remove the bowl from the mixer, sift 2-3 tablespoons of the pre-sifted flour mix over the whipped eggs and fold it in with a silicone spatula using a circular motion taking care to reach the bottom of the bowl. The foam will deflate a little and there is no need to try and incorporate all the flour at this stage,  it will be mixed in completely at the end.
7.  Just before the addition of the last bit of flour, drizzle the warm, melted butter over the batter and quickly sift the rest of the flour mix over the batter. Fold into the batter completely within 30 seconds. 
8. Using the rubber spatula, transfer the batter into the prepared baking pan. Leave behind any residual flour or butter that might be stuck at the bottom of the bowl or this will prevent the cake from rising evenly. 
9. Gently tap the pan to remove any trapped air bubbles and bake it in the preheated oven for 30 minutes. The cake is completely baked when the center of the cake when pressed springs back. Remove the pan from the oven and cool for 10 minutes. Spray a cooling wire rack with nonstick cooking spray oil, run a knife around the edges of the cake to loosen it and flip the cake over the wire rack. Allow to cool completely before icing.

swiss buttercream frosting

yields: about 3 1/2 cups

ingredients

4 large egg whites
3/4 cup (4 1/4 ounces) confectioner's sugar
3 sticks(1 1/2 cups  or 12 1/8ounces) unsalted butter, soft but slightly firm to touch
2 tablespoons raspberry liqueur 
1 teaspoon vanilla extract
4 drops red food coloring (optional, you can adjust the amount to get the desired level of pink color you desire)

1. Whisk the egg whites in the bowl of an electric mixer until the eggs get foamy. 
2. Place the bowl over a saucepan with simmering water. The water should not touch the base of the bowl. Add the sugar, 2 tablespoons at a time to the eggs and continue to whisk for about 30 seconds for each addition. Continue whisking the egg whites for 3 minutes, the whites will begin to warm up and the entire mixture will become white and thick. 
3. Remove the bowl from the saucepan and place it under the electric mixer.  Using the whisk attachment, whisk the mixture for 8 minutes at medium-high speed to form a thick white meringue-like mixture. Set aside.
4. In a separate mixing bowl, beat the butter for 1 minute with an electric mixer. (I used a handheld mixer for this but if you have another mixing bowl for your stand mixer, you can use the paddle attachment at medium-low speed). The butter should be soft but not warm. Keep aside.
5. Using the whisk attachment of you stand mixer, beat in the butter, 2 tablespoons at a time into the egg mixture, about one minute for each addition.
6. Add the raspberry liqueur, the vanilla, and the food coloring and beat for 1 minute until thick and creamy. Cover the frosting with cling film and refrigerate for 30 minutes before use. 

raspberry syrup

yields: about 3/4 cup

ingredients

1/3 cup water
1/3 cup sugar
1/4 cup raspberry liqueur

1. Mix all the ingredients together in a saucepan and bring to a boil. Reduce to a simmer and cook until the mixture reduces to half its volume. 
2. Cool and refrigerate completely before use.

Assembling the cake

ingredients

1 cup dark chocolate shavings

1. Place the two cooled cakes over each other with the top side of each cake facing downwards on flat plate or cake board. This top crust creates a good support for the cake structure. With a sharp serrated knife trim the edges of the cakes. With the knife, make a small notch on one side of both cakes, this will help with aligning the cakes later.
2. Carefully remove the top cake layer and place aside.  
3. Start working with the lower cake layer. With a brush, spread half of the raspberry syrup over the cake. 
4. Layer the surface with a thin crumb coat of the frosting. Place the cake in the refrigerator for 15 minutes to harden the crumb coat.
5. Remove the cake from the refrigerator and spread 1 cup of frosting in an even layer using an offset spatula. Return the cake to the refrigerator and let it chill for 20 minutes. 
6. Place and align the second cake layer on top of the chilled frosted layer of the bottom cake layer, using the notches created earlier to correctly align the cakes. The bottom of the second cake layer should face the frosting of the first cake layer.
7. Brush the rest of the raspberry syrup over the upper layer. Refrigerate the cake for 15 minutes. Spread a thin crumb coat of frosting on top of the cake and refrigerate for another 15 minutes. Carefully spread out the rest of the frosting in an even layer on the top surface of the chilled cake with the offset spatula. 
8. Generously sprinkle the chocolate shavings over the cake and refrigerate the cake for at least 30 minutes before serving. To get clean even cake slices, place a sharp serrated knife under running hot tap water, wipe the blade with a clean towel and cut the slice. Repeat this for each cake slice, this will prevent any crumbs from sticking to the frosting and it will ensure a clean cut.