BK’s Choco-Tectural Marquis


Cake Layer:

Melted butter for greasing the pan

1 ½ Tablespoons ground hazelnuts (plus extra for dusting the pan ) about 1/3 cup whole hazelnuts

( You can also substitute ground almonds)

7 ounces of dark chocolate (minimum 60% cocoa content, I used Ghirardelli Bittersweet 60% cocoa)

3.5 ounces dark orange flavored chocolate (I used Green & Blacks Maya Gold)

(If you prefer you can use 10.5 ounces of dark chocolate)

1 ½ cup superfine sugar

5 ½ ounces unsalted butter

5 large eggs

Pinch salt


Preheat the oven to 350 degrees.

Toast the hazelnuts for about 7 – 10 minutes to loosen the skins.  Rub the nuts together in a tea towel to remove the skins.  Grind the nuts in the food processor until very fine but not greasy or pasty.  Reserve 1 ½ Tablespoons of nuts.


Brush a 9 inch springform pan with melted butter and dust with the remaining hazelnuts and set aside.


In a large bowl set over a saucepan of simmering water, melt the chocolate, butter, sugar and salt.  When melted remove the bowl  from the pan and set aside.


Whisk the eggs together with the hazelnuts and fold into the chocolate mixture.  Continue folding until the mixture thickens.  About 2 minutes.  Pour the batter into the prepared springform pan and bake for 35-40 minutes, until a cake tester inserted into the center comes out clean.  The cake will resemble baked brownies.        Set the cake on a rack to cool completely.  Allow the cake to cool at least 2 hours before beginning the mouse.


Mouse Layer:


9 ounces of milk chocolate (You can also use all dark chocolate, minimum 60% cocoa content)

¾ cup confectioners sugar, sifted

6 ounces unsalted butter

5 large eggs, separated

2/3 cup whipping cream

Cocoa powder for dusting


In a large bowl over a pan of simmering water, melt the chocolate.  When melted remove the bowl from the pan and add half of the confectioners sugar, stir, and then whisk in the butter. Whisk in the egg yolks, one at a time.  Set this mixture aside.


In the bowl of a stand mixer, using the whisk attachment, whip the egg whites until stiff peaks form.  Add the remaining confectioners sugar and continue to whisk until the egg whites are glossy.  Set aside.  Whip the whipping cream until stiff peaks form.


Add one third of the egg whites to the chocolate mixture and fold them in to lighten the mixture.  Gently fold in the remaining whites  alternating with the whipped cream being careful to retain as much volume as possible.  Do not overmix, but ensure that the mixture is well blended.  Pour the mousse over the cooled cake base in the springform pan and refrigerate overnight.


Remove the pan from the refrigerator about 15 minutes before serving.  Dip a thin bladed knife in hot water and slide it around the sides of the pan to loosen the cake from the pan and remove the ring.  Dip the knife in hot water again and gently smooth the sides of the mousse.

Keep the cake on the removeable bottom and place it on a serving plate.  Dust the cake with cocoa powder.


Serve with crème fraiche, crème anglais, or softly whipped cream.


Makes about 15 small slices.