Cake:

1. Preheat oven to 350 degrees Fahrenheit. Line an 8-inch springform pan with parchment paper.
2. Beat egg whites with 1/2 cup of sugar in the bowl of a stand mixer fitted with the whisk attachment on high speed for about 8 minutes or until stiff peaks form. Place in a large bowl and set aside.
3. Using the bowl of the stand mixer again, mix egg yolks with the remaining 1/2 cup sugar and vanilla extract. At medium speed, beat until thick and creamy.
4. Add the egg yolk mixture to the egg white mixture. Fold it in using a spatula. It is important that you do not stir the mixture.
5. In a separate bowl, combine all-purpose flour, cornstarch, baking powder, and cocoa powder. Sieve over the egg mixture and then fold in carefully until combined.
6. Transfer the mixture to the springform pan and smooth the top using a silicone spatula. Bake for about 25 minutes.
7. Carefully turn the cake onto a cooling rack lined with parchment paper. Get rid of the parchment paper at the bottom and allow the cake to cool completely.
8. Once the cake is cooled completely, cut into 3 even layers using a serrated knife.

Cherry filling:

1. From the 1 cup of cherry juice, remove 4 tablespoons. In a small bowl, combine it with sugar and cornstarch.
2. Place the remaining cherry juice in a small saucepan and bring it to a simmer. Remove from heat and add the cornstarch mixture. Bring back to a simmer while whisking until it thickens.
3. Add the cherries and remove from heat. Add about half of the kirsch and let cool for about 5 to 10 minutes.

Whipped cream:

1. Beat 4 cups of heavy cream in the bowl of a stand mixer fitted with the whisk attachment at high speed until soft peaks form. Add 1/2 cup of powdered sugar and beat for about 2 to 3 minutes or until stiff peaks form.
2. Refrigerate until ready to assemble.

Assemble the cake:

1. Put the top cake layer on a platter.
2. Drizzle some cherry juice over the cake layer and then top with half of the cherry mixture. Be sure to leave a 1-inch border.
3. Top with 1/4 of the whipped cream. Smooth it out using a spatula.
4. Put the middle cake layer on top and drizzle again with the liquid, followed by the cherries and cream.
5. Put the third cake layer on top. Spread about 1/3 of the remaining whipped cream on top.
6. Spread the remaining cream on the sides of the cake.
7. Decorate the sides with grated chocolate.
8. Pipe 16 swirls of whipped cream on top and garnish the center of the cake with the remaining grated chocolate.
9. Put a cherry on each swirl.