Chocolate Tomato Cake with Mystery Ganache
September 25, 2010
My good friend Anne’s birthday was this week, and of course I had to make her a cake. I’ve been wanting to make this cake for awhile…ever since the cookbook its in, “Rose’s Heavenly Cakes” by Rose Levy Beranbaum, was open to its page on the counter of my pastry-chef friend Misa’s kitchen. The cookbook is gorgeous…Rose’s cakes are stunning, and the other ones I’ve made so far are delicious. But this particular recipe intrigued me, mainly because I think it’s fun making cakes with unlikely ingredients, like one of my favorites, chocolate Guinness cake. Because there’s a million other cakes on my “must make” list, it took me awhile to get around to it. But Anne asked for chocolate, and this cake immediately came to mind.
The cake is rich and dense, with a unique tangy flavor from the soup. The ganache frosting was my favorite part about it though…very decadent. And I had to decorate it just like the photo in the book! I know that’s very unimaginative of me, but its just too cute to pass up.
Chocolate Tomato Cake with Mystery Ganache
from Rose’s Heavenly Cakes by Rose Levy Beranbaum
~~~Be sure to make the ganache plenty of time beforehand…it takes several hours to set!~~~
1 cup plus 2 tbsp sifted unsweetened cocoa powder
1 can (1 cup) Campbell’s Tomato Soup
4 large eggs, room temp (3/4 cup)
1 tbsp vanilla extract
3 cups plus 2 tbsp sifted cake flour
2 cups superfine sugar**
1 1/2 tsp baking powder
1/2 tsp baking soda
3 1/2 sticks unsalted butter, room temperature
Coat two 9×2″ round cake pans with shortening, then line with parchment paper, then coat with baking spray, and dust with flour. (FYI-I actually just line with parchment rounds, then coat the rounds and sides of the pans with shortening, and that always works just fine). Preheat the oven to 350 degrees and set oven rack in lower third of the oven.
In a medium bowl, whisk the cocoa, tomato soup, eggs and vanilla until smooth. In the bowl of a stand mixer fitted with the flat beater, mix the flour, sugar, baking powder and baking soda on low speed for 30 seconds. Add the butter and half the cocoa mixture. Mix on low speed until the dry ingredients are moistened. Raise the speed to me3dium and beat for 1 1/2 minutes. Scrape down the sides of the bowl.
Starting on medium-low speed, with the mixer off between additions, add the remaining cocoa mixture in two parts. Beat on medium speed for 30 seconds after each addition to incorporate the ingredients and strengthen the structure. Scrape down the sides of the bowl. Using a silicone spatula, scrape the batter into the prepared pans, being sure to press the thick and fluffy batter against the sides of the pans, and smooth the surfaces evenly.
Bake for 30 to 40 minutes (check a little early…mine was done in 29 minutes), or until a cake tester inserted in the centers comes out clean. The cakes should start to shrink from the sides of the pans only after removal from the oven.
Let the cakes cool in the pans for 10 minutes on a wire rack. Run a small metal spatula between the sides of the pans and the cakes, pressing firmly against the pans, and invert the cakes onto wire racks that have been coated lightly with cooking spray. Re-invert them right side up to prevent splitting. Cool completely.
12 oz. dark chocolate, 60%-62% cacao, chopped
12 oz. (almost 1 1/2 cups) heavy cream
1/4 cup Campbell’s Tomato Soup
1 tube red tinted buttercream (it’s fine to use the Wilton tubed variety) (optional)
2 cans 4″ Pirouette Rolled Wafer Cookies, preferably Pepperidge Farms (optional)
In a food processor, process the chocolate until very fine. In a 4 cup or larger microwaveable cup with a spout (or in a medium saucepan, stirring often), whisk together the cream and tomato soup and scald it (heat it to boiling point; small bubbles will form around the periphery).
With the motor of a food processor running, pour the cream mixture through the feed tube in a steady stream. Process for a few se3conds until smooth. Scrape the ganache into a glass bowl and allow it to sit for 1 hour. Cover it with plastic wrap and allow it to cool at room temperature for several hours, or until the mixture reaches frosting consistency (I finally stuck it in the fridge for a few hours…just make sure you check it every once in awhile so it doesn’t get too thick!). The ganache keeps for 3 days at room temperature, for 3 weeks refrigerated, and for 6 months frozen.
Compose the cake:
When the cakes are completely cool, spread a little ganache on a serving plate and set the first layer on top. Slide a few wide strips of wax paper or parchment under the cake to keep the rim of the plate clean. Spread about 1 cup of the ganache over the layer. Place the second layer on top and use the remainder to frost the top and sides. With the tip of a 1 1/4″ wide metal spatula, make wavy lines through the ganache on top of the cake. Slowly slide the paper strips from under the cake. If storing the cake under a cake dome, allow the ganache to set for a minimum of 3 hours or overnight before applying the Pirouettes or the moisture from the ganache will soften them.
To surround the cake with the Pirouettes, you may first have to trim them to 4 inches (I didn’t, and I wish I would have), using a small serrated knife. Repair any broken ones using ganache and press them gently against the sides of the cake. The ganache will hold them in place. If desired, pipe little flames of red buttercream on top of each Pirouette.
**My cakes would sometimes (a lot of times, actually) be really dense at the bottom, and light at the top, and wouldn’t be as high as they should have been. I started looking into it, and learned that sugar actually varies by region; some places coarser than others. If your sugar is too coarse, it will cause the cake to fall, creating a dense, sort of custardy cake. I guess I live in a coarse sugar region. So the solve is to either process your sugar in a blender (not a food processor) for a few pulses until it’s finer (but be careful not to do too many pulses, because it will start to turn into powdered sugar), or buy superfine sugar, available at most grocery stores.