The grand finale of any meal is the dessert. When people leave the table, the last thing they remember is the wonderful dessert you made! What could be better after one of your fabulous meals than a light, but rich and flavorful chocolate dessert? Multiple layers of light, deep dark chocolate cake, surrounded by smooth heavenly chocolate mousse, covered in a decadent, rich and fudgy chocolate ganache
1. Line two half sheet pans with parchment paper. Set aside. Preheat oven to 350° F.
2. Sift together potato starch, cocoa and salt. Set aside. Place the room temperature egg yolks in a large mixing bowl. Using an electric mixer fitted with a whisk attachment, beat the egg yolks and ¾ cup sugar until light yellow and tripled in volume, about 3 minutes, scraping down the sides of the bowl periodically. Add in the water and vanilla. Beat on high for another minute until the water and vanilla are incorporated.
3. Using a large rubber spatula, fold in half the sifted dry ingredients into the yolk mixture. Set aside.
4. Combine room temperature egg whites with the vinegar in a large mixing bowl. Using an electric mixer fitted with a clean, dry, whisk attachment, whip egg whites on high speed until very foamy and increased in volume. Gradually add remaining ¾ cup sugar in a steady stream. Whip just until stiff peaks form. Do not overbeat.
5. Fold the egg whites into the yolk mixture in three additions. Sift remaining dry ingredients into the egg mixture in two additions, scraping the sides and bottom of the bowl and being very careful not to deflate the batter.
6. Divide the batter between the two pans. Smooth with a spatula. Bake for 15 minutes. Rotate pans and bake an additional 7 minutes, until cake springs back when touched. Remove from oven and place on racks to cool.
7. Fudgy Chocolate Ganache: In a medium saucepan, bring cream to a boil. Remove from heat. Add chocolate chips to the cream – do not mix. Let mixture rest for 2-3 minutes. Mix until smooth. Allow to cool for 30 minutes before glazing cake.
8. Heavenly Chocolate Mousse:
a. Place cold water in a small bowl. Sprinkle gelatin over the water and immediately mix with a whisk to remove any lumps. Set aside for at least 5 minutes, whisking periodically to remove any additional lumps.
b. Fill a pot 1/3 of the way with hot water. Bring to a boil, then reduce heat to medium-low to simmer. Place egg whites and sugar in a clean, dry bowl of an electric mixer. Set the bowl over the simmering water. Whisk continuously until the mixture is hot3 to the touch, when you feel the egg white mixture it doesn’t feel gritty and all the sugar is dissolved. Remove the bowl from the heat, add in the gelatin, and beat on high speed until the egg whites cool and form very still peaks, approximately 5-7 minutes depending upon your mixer.
c. Fold the melted chocolate into the beaten egg whites. Set aside.
d. In a separate mixing bowl, whip the cream until it holds a peak. Fold the cream into the whites, being very careful not to deflate the whites.
To Assemble the Cake:
1. Using a very sharp, serrated knife, loosen cakes from sides of pans. Invert each cake onto a piece of parchment paper the size of the pan. Remove parchment liner from the cake. Using a ruler to ensure even sections, divide the each of the chocolate into 3 sections lengthwise. You will have 6 cake sections, each approximately 4” wide. Trim ends if desired.
2. Place one of the cake sections, bottom side up, on a long cake plate or cake board. Cover with a thin layer of mousse. Smooth the mousse with an offset spatula.
3. Repeat step 2, layering remaining cake and mousse, finishing with a cake layer, being careful to keep the mousse within an 1/8th of the sides of the cake.
4. Cover the entire cake with a very thin layer of the prepared ganache. Smooth with an offset spatula. This layer of ganache is used to set the cake.
5. Refrigerate cake for 30 minutes until ganache is set.
6. Remove cake from refrigerator and cover with an additional layer of ganache. Decorate with remaining ganache.
7. Refrigerate at least 1 hour before serving.
8. Serve with chocolate drizzle and fresh fruit.
* A quick way to bring eggs to room temperature is to fill a bowl with very warm water. Place the eggs in the bowl. Allow the eggs to sit in the warm water for approximately 5 minutes.
** Pasteurizing Egg Whites: Raw egg whites carry the risk of salmonella, so how do you make an egg white based mousse using raw egg whites? The key is either using store bought pre-pasteurized eggs, or pasteurizing the egg whites yourself. I don’t always have the pasteurized eggs handy, so I usually pasteurize them myself. By cooking the egg whites and sugar over a double boiler until very hot, you kill any bacteria, thereby pasteurizing the egg whites. You pasteurize the egg whites with the sugar because if you leave it out you’re just scrambling eggs!
*** The better quality the chocolate, the better the mousse and ganache will taste. During the year, I use a bittersweet chocolate chip that has at least 54% cocoa. For Pesach I use the best quality chocolate chips I can find, usually marked “real” semi-sweet chocolate.