Half of the cake stuck to the tinfoil in the bottom of the pan (that's why the recipe calls for parchment paper, I guess) so I made a few mini opera cakes with the bits and peices of cake that I could peel off of the tinfoil. So I was pretty frustrated by the time I finally finished making the cake, but then when I tasted it suddenly it was all okay. It wasn't pretty, but we all agreed that it was tasty.
I came away with my new favorite buttercream, and ideas of how to make the cake simpler and more delicious- by making just the cake, buttercream, and sugar syrup (no mousse or glaze). Oh yeah- and next time I will be buying almond meal at whole foods instead of blanching and processing my own almonds.
Here's the recipe, but just the parts I recommend.
For the cake (Joconde)
6 large , at room temperature
2 tbsp. (30 grams) granulated sugar
2 cups (225 grams) ground blanched almonds
2 cups icing sugar, sifted
6 large eggs
½ cup (70 grams) all-purpose flour
3 tbsp. (1½ ounces; 45 grams) , melted and cooled
Divide the oven into thirds by positioning a rack in the upper third of the oven and the lower third of the oven. Preheat the oven to 425◦F. (220◦C). Line two 12½ x 15½- inch (31 x 39-cm) jelly-roll pans with and brush with melted butter.
In the bowl of a stand mixer fitted with the whisk attachment (or using a handheld mixer), beat the egg whites until they form soft peaks. Add the granulated sugar and beat until the peaks are stiff and glossy. If you do not have another mixer bowl, gently scrape the meringue into another bowl and set aside. If you only have one bowl, wash it after removing the egg whites or if you have a second bowl, use that one. Attach the paddle attachment to the stand mixer (or using a handheld mixer again) and beat the almonds, icing sugar and eggs on medium speed until light and voluminous, about 3 minutes. Add the flour and orange zest and beat on low speed until the flour is just combined. Using a rubber spatula, gently fold the meringue into the almond mixture and then fold in the melted butter. Divide the batter between the pans and spread it evenly to cover the entire surface of each pan.
Bake the cake layers until they are lightly browned and just springy to the touch. This could take anywhere from 5 to 9 minutes depending on your oven. Place one jelly-roll pan in the middle of the oven and the second jelly-roll pan in the bottom third of the oven. Put the pans on a heatproof counter and run a sharp knife along the edges of the cake to loosen it from the pan. Cover each with a sheet of parchment or wax paper, turn the pans over, and unmold. Carefully peel away the parchment, then turn the parchment over and use it to cover the cakes. Let the cakes cool to room temperature.
For the syrup:
½ cup (125 grams) water
⅓ cup (65 grams) granulated sugar
1 to 2 tbsp.coconut extract
Stir all the syrup ingredients together in the saucepan and bring to a boil.Remove from the heat and let cool to room temperature.
For the buttercream (YOU WILL NEED AT LEAST DOUBLE THIS RECIPE- I WOULD TRIPLE IT)1 cup (100 grams) granulated sugar (Used to say 2 cups but should be 1 cup)
¼ cup (60 grams) water (Used to say ½ cup but should say ¼ cup)
seeds of one vanilla bean (split a vanilla bean down the middle and scrape out the seeds) or 1 tbsp. pure vanilla extract
1 large egg
1 large egg yolk
1¾ sticks (7 ounces; 200 grams) unsalted butter, at room temperature (Used to say 1¾ cups of butter but it should be 1¾ sticks).
Coconut Extract- about 1 Tablespoon)Combine the sugar, water and vanilla bean seeds or extract in a small saucepan and warm over medium heat just until the sugar dissolves.Continue to cook, without stirring, until the syrup reaches 225◦F (107◦C) (Note: The original recipe instructs to heat the syrup to 255◦F (124◦C). We heated it to 225◦F and it worked just fine. However, if you are concerned, then by all means heat your syrup to 255◦F.) on a candy or instant-read thermometer. Once it reaches that temperature, remove the syrup from the heat.While the syrup is heating, begin whisking the egg and egg yolk at high speed in the bowl of your mixer using the whisk attachment. Whisk them until they are pale and foamy.When the sugar syrup reaches the correct temperature and you remove it from the heat, reduce the mixer speed to low speed and begin slowly (very slowly) pouring the syrup down the side of the bowl being very careful not to splatter the syrup into the path of the whisk attachment. Some of the syrup will spin onto the sides of the bowl but don't worry about this and don't try to stir it into the mixture as it will harden!Raise the speed to medium-high and continue beating until the eggs are thick and satiny and the mixture is cool to the touch (about 5 minutes or so).While the egg mixture is beating, place the softened butter in a bowl and mash it with a spatula until you have a soft creamy mass.With the mixer on medium speed, begin adding in two-tablespoon chunks. When all the butter has been incorporated, raise the mixer speed to high and beat until the buttercream is thick and shiny.At this point add in your flavouring and beat for an additional minute or so.Refrigerate the buttercream, stirring it often, until it's set enough (firm enough) to spread when topped with a layer of cake (about 20 minutes).