The Dark and White Chocolate Truffle Cake is a luxurious and decadent dessert that brings together the richness of dark and white chocolate in a delightful combination. This indulgent cake features layers of moist and tender chocolate cake, filled with creamy white chocolate whipped ganache, and coated with a velvety dark chocolate frosting. The addition of cake truffles made from the cake’s edges and tops, mixed with chocolate ganache, adds an extra touch of luxury and deliciousness to the cake.

The history of chocolate cakes can be traced back to the 18th century when chocolate became more accessible and affordable in Europe. Chocolate cakes have since evolved and become a staple in dessert menus around the world. The combination of dark and white chocolate in this particular truffle cake adds a unique twist, appealing to chocolate lovers with different tastes.

The cake’s truffles, made from the cake’s cut edges and tops, offer a sustainable way to utilize the cake scraps, adding to the cake’s appeal. This cake is often served on special occasions, celebrations, or any time when a sumptuous treat is desired.

INGREDIENTS

Cake Layers:

• 6 ounces bittersweet chocolate, finely chopped
• 1 stick unsalted butter
• 1/2 cup unsweetened cocoa powder
• 1 cup water
• 2/3 cup mascarpone cheese, room temperature
• 3 large eggs
• 3 large egg yolks
• 1 cup granulated sugar
• 1 cup light brown sugar
• 1 1/4 cups all-purpose flour
• 1 tablespoon baking soda
• 2 teaspoons baking powder
• 1 teaspoon salt

White Chocolate Whipped Ganache:

• 1 pound white chocolate, chopped
• 3/4 cup heavy cream
• 2 tablespoons unsalted butter
• 2 cups powdered sugar

Milk Chocolate Whipped Ganache:

• 1 1/3 cups heavy cream
• 10 ounces milk chocolate, chopped
• 3 cups powdered sugar

Dark Chocolate Frosting:

• 4 ounces dark chocolate, chopped
• 3 tablespoons granulated sugar
• 1/4 cup corn syrup
• 6 tablespoons unsweetened cocoa powder
• 1/4 cup plus 2 tablespoons water
• 1 pound (4 sticks) unsalted butter, softened
• 3/4 cup powdered sugar

Cake Truffles:

• 1 1/2 cups milk chocolate ganache
• Cake edges and top
• 10 ounces dark chocolate

INSTRUCTIONS

Cake Layers:

1. Preheat the oven to 350°F.
2. Prepare an 18×13-inch sheet cake pan by spraying it with non-stick baking spray and lining it with parchment paper. Spray the parchment paper with baking spray.
3. In a medium saucepan, melt the chopped chocolate with the butter over very low heat, stirring gently. Once the chocolate has completely melted, remove the mixture from the heat and let it cool slightly.
4. In a small saucepan, combine the cocoa powder with the water and bring it to a boil, whisking constantly. Let it cool slightly, and then whisk the mixture into the melted chocolate. Whisk in the mascarpone cheese.
5. In a large bowl or in the bowl of an electric mixer fitted with the whisk attachment, beat the whole eggs, egg yolks, granulated sugar, and light brown sugar at medium speed until pale and fluffy, about 5 minutes. Beat in the chocolate mixture.
6. In a medium bowl, whisk together the dry ingredients: all-purpose flour, baking soda, baking powder, and salt. Using a spatula, gently fold the dry ingredients into the cake batter until fully incorporated.
7. Transfer the batter to the prepared pan and bake the cake in the lower third of the oven for 25 to 30 minutes, until the centers spring back when lightly pressed.
8. Let the cake cool completely in the pan.

White Chocolate Whipped Ganache:

1. In a medium bowl set over a medium saucepan of simmering water, melt the white chocolate. Remove from the heat and set aside.
2. In a saucepan, add the heavy cream and butter, and heat until the butter is melted and small bubbles appear around the edges.
3. Whisk the hot cream mixture into the melted white chocolate. Lumps may appear, but continue to quickly mix until the mixtures combine and the lumps disappear. Set the bowl in a cool place for at least 1 hour.
4. Once the ganache has cooled down, using a hand mixer or an electric mixer, whisk in the powdered sugar. Cool the mixture for a few minutes only, as it will stiffen in the fridge.

Milk Chocolate Whipped Ganache:

1. In a medium saucepan, heat the cream until small bubbles appear around the edges. Put the chopped milk chocolate in a heatproof bowl and pour the hot cream on top. Let stand for 2 to 3 minutes, until the chocolate has melted, then whisk until shiny and smooth. Set the bowl in a cool place for at least 1 hour.
2. Once the ganache has cooled down, measure 1 1/2 cups of chocolate ganache and set it aside for the cake truffles.
3. Using a hand mixer or an electric mixer, whisk in the powdered sugar into the remaining chocolate ganache. Cool the mixture for a few minutes only, as it will stiffen in the fridge.

Dark Chocolate Frosting:

1. In a medium saucepan, melt the dark chocolate over very low heat, stirring frequently. In a small saucepan, whisk together the granulated sugar, corn syrup, cocoa powder, and water, and bring it to a boil, whisking constantly. Remove from the heat and whisk in the melted chocolate. Let it cool completely, about 30 minutes.
2. In the bowl of an electric mixer fitted with a wire whisk, beat the softened butter at medium speed until light and fluffy. Add the cooled chocolate mixture and whisk until fully combined. With the mixer on low speed, beat in the powdered sugar until fully combined.

Cake Arrangement:

1. Cut out a 5-by-11-inch cardboard rectangle.
2. Carefully transfer the cake from the pan to a working area, holding the parchment paper with the cake while someone pulls the pan.
3. Once the cake is on the working area, place the cardboard one inch from the left corner and cut a rectangle. Repeat this process, moving to the right, until you have 3 rectangles. Use a cake leveler to level the tops of the rectangles.
4. Transfer the cake edges and removed tops to a medium bowl and crumble them with your hands. Set them aside as you will be using them for the cake truffles.
5. Using a cake lifter, transfer one of the rectangles to a flat rectangle platter; this will be the first layer.
6. Spoon dollops of milk chocolate whipped ganache onto the cake and spread it evenly, making the layer as thick as you want. Reserve a small amount of chocolate whipped ganache for later.
7. Top the milk chocolate ganache layer with another cake rectangle and top it with white chocolate whipped ganache. Repeat this process, placing the final layer on top. Use the reserved chocolate whipped ganache to spread on the top layer.
8. Coat the sides and top of the cake with a thick layer of dark chocolate frosting and refrigerate it to set the frosting.

Cake Truffles:

1. Mix the cake truffles (made from cake edges and tops) with the milk chocolate ganache in a bowl using a fork until well combined. You can shape small golf ball-sized cake balls and place them on parchment paper, then refrigerate them until firm.
2. Alternatively, you can use a silicone petit four cake or truffle form. Press the cake truffle batter, which is soft at this point, into the form, then refrigerate it for a few hours. Once ready, remove from the silicone form and place the cake truffles on top of the cake. The recipe should yield 16 truffles.

Chocolate Coating:

1. In a medium bowl set over a medium saucepan of simmering water, melt the dark chocolate. Remove from the heat and set aside for a few minutes to cool down.
2. Pour the melted dark chocolate over the cake truffles and the entire cake.

Serving:

1. When serving the cake, run a knife through hot water before slicing it while the cake is cold. Let the slices come to room temperature before serving.

This Dark and White Chocolate Truffle Cake is a delightful and impressive dessert, perfect for celebrations and special occasions, sure to satisfy the cravings of any chocolate lover. Enjoy!