Mocha Cake with Swiss Meringue Buttercream
“As long as you have life and breath, believe. Believe for those who cannot…Never give up, never despair, let no mystery confound you into the conclusion that mystery cannot be yours.”
– Mark Helprin.
Coffee. And chocolate. In a cake. Life is good.
I’ve been wanting to work on my cake decorating skills (always a weakness for me), so this beauty of a mocha cake is all decked out for spring. For Easter, to be exact. (I’m delighted to be sharing the cake with some dear friends but we’ll see if it makes it until Sunday.) Flavor’s not usually an issue for me, and the Swiss meringue buttercream came out beautifully. The chocolate bird’s nest, however…well, we’ll have to see. And don’t even get me started on the white chocolate bird’s eggs.
The Mocha Cake
My recipe for mocha cake is pretty straight-forward. (And delicious.) The one tip I have is to dust the cake pans with cocoa powder before baking. Why not add an extra layer of yum?
The Swiss Meringue Buttercream
I’m not a huge fan of frosting, especially the overly-sweet, sugary kind typical of American buttercream and featured on a lot of cakes and cupcakes. Now a cream cheese, or really buttery frosting, sign me up.
Which is probably why Swiss meringue buttercream is my favorite for cakes – all that butter! (Though I like the Italian meringue method for macarons.) I’ve played with this recipe a bit and this is the combo of egg whites, sugar, and butter that I feel works the best. It’s a pretty stable meringue, easy to remedy when it goes awry, and ends up super fluffy and creamy.
The Chocolate and Candy Eggs
Okay, here’s where we reach the “Reality Bakes” part of the post. Two tries with tempering and dyeing white chocolate and my robin’s eggs still came out a sort of muddy teal color, and wouldn’t set properly.
I suspect the culprit was the oil candy dye, because the original melted chocolate was the perfect temperature and beautiful and glossy. I had to add so much of the dye to get (close to) the desired color that I think it screwed it up, even though I warmed the oil coloring first.
Still, I learned a few things, so for what it’s worth:
- When dyeing white chocolate, you should use oil-based candy coloring, not the water-based ones. I had a heck of a time finding oil-based colors and want to give a word of warning: Google searches for oil colors will take you to dyes that are actually water-based. I was stuck mixing blue with a little yellow of the AmeriColor brand but could never achieve the bright robin’s egg blue I was after.
- I had some sky blue candy melts on hand in case the white chocolate didn’t work out (I had a feeling) and they came out pretty well. Easy to use, too. You just melt the chips in the microwave and pour them into the molds. My problem was that I was using small egg molds which require you to stick the two halves together, leaving an obvious seam. I used a little of the melted candy to stick the halves together, then very lightly dipped my finger in warm water and rubbed it over the ugly seam to smooth it out.
- Or, you could just buy Cadbury eggs like normal people and use those.
The Chocolate Nest
I enjoy chocolate work and was excited to try out some new techniques from Ann Reardon and her site How To Cook That. I could have gone the corn flake or chow mein noodles route, but I loved how twiggy and real Ann’s nests look. And…chocolate.
I guess it was just one of those days because my first nest collapsed. Right after that my frosting bag split down the middle and shot chocolate all over the kitchen.
Round two came out much better but it’s a delicate little thing, that nest. And I had to stick it in the freezer to firm it up. Check out Ann’s video and give it a try sometime. I’d love to hear how it works out for you.
Mocha Cake
Ingredients
For the cake:
- 3/4 cup cocoa powder, sifted, plus more for dusting
- 2 1/4 cup flour
- 3/4 tsp baking powder
- 1 tsp baking soda
- 3 eggs
- 3/4 cup butter
- 1 3/4 cups sugar
- 1 1/2 tsp vanilla
- 3/4 cup buttermilk
- 1 cup strong, freshly brewed hot coffee
- 1 tsp fine sea salt
Mocha Swiss Meringue Buttercream:
- 6 large egg whites
- 2 cups granulated sugar
- 2 cups unsalted butter, room temperature, cubed
- 1/4 tsp kosher salt
- 1 tsp vanilla
- 1 1/2 tbsp espresso powder*
- 5 oz bittersweet chocolate chopped, melted and cooled
Instructions
Cake:
- Pre-heat oven to 350°F.
- Grease three 6-inch round cake pans and dust with cocoa powder. Line the bottoms of the pans with parchment rounds and set aside.
- In a large bowl, sift together the flour, cocoa powder, baking powder, baking soda and salt. Set aside.
- Combine the butter and sugar in the bowl of a mixer and beat together.
- With the mixer going, add one egg at a time to the bowl.
- When all the eggs have been incorporated, scrape down the bowl and add the vanilla. Mix briefly to combine.
- Add the dry ingredients slowly in three batches, mixing to combine, until incorporated. The batter should be very thick.
- Slowly add the buttermilk, and then the coffee, mixing on medium-low until incorporated and the batter is thinner.
- Pour the batter evenly into the three greased cake pans.
- Bake for 30-35 minutes or until a toothpick inserted in the center comes out mostly clean.
- Remove from the oven and let cool for at least 10 minutes in the pans, then transfer to cooling racks.
Mocha Swiss Meringue Buttercream:
- Place egg whites and sugar into the bowl of a stand mixer, and whisk until combined.
- Set mixer bowl over a saucepan filled with 1 inch of gently simmering water, making sure bottom of the bowl does not touch the water. Heat, whisking constantly, until sugar is fully dissolved, or a thermometer registers 160°F. (Rub the mixture between two fingers to test for grittiness.)
- Dry off bottom of the bowl and place back on the stand mixer. Whisk on high speed until the meringue is glossy and can hold stiff peaks, and the bowl is cooled, usually about 5 to 10 minutes, but could be longer.
- Switch from the whisk to the paddle attachment.
- Slowly add the cubed butter piece by piece, beating well on medium speed after each addition. When all the butter has been added, scrape down the sides of the bowl and raise the speed to medium-high. Beat until the buttercream is thick and fluffy.
- When buttercream is fluffy and smooth, add the salt, vanilla, melted chocolate, and espresso powder, and beat on medium-high until incorporated and buttercream is smooth.
- Buttercream can be made ahead of time and frozen. To use, bring back to room temperature, then beat until smooth again.
Assembly:
- Place the first layer of cake on a cake stand or plate. Top with frosting and spread evenly with an offset spatula or butter knife. (With all the butter in this buttercream, the hot water/spatula method isn’t suitable here.) Repeat with remaining layers, then frost the whole cake in a thin layer; this is the crumb coat. Chill for 20 to 30 minutes.
- Frost the top and sides of the cake, and smooth. Serve as is, or decorate as desired.
Notes
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