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For the cake:
- 125ml boiling water
- 56g unsweetened chocolate,
- 60g unsalted butter, cut into pieces
- 1 large egg, room temperature
- 100g sugar
- 1 tsp vanilla extract
- 160g plain flour
- 1 tsp baking powder
- 3/4 tsp bicarbonate of soda
- 1/4 tsp salt
- 125ml hot, strongly brewed coffee
For the mousse:
- 720ml cream, divided
- 340ml milk chocolate,
- 3 large egg yolks, room temperature
- 100g sugar
- 80ml water
For the chocolate glaze:
- 125ml water
- 100g sugar
- 60ml cream
- 60g Dutch process cocoa powder, sifted
- 1 1/2 tbsp unflavoured gelatine powder
How to make Rich Chocolate Mousse Cake
1. For the cake, preheat the oven to 160°C. Grease 2 8-inch round cake pans, line the bottoms with parchment paper and then lightly dust the sides of the pan with flour, tapping out any excess. *Please note that only 1 cake layer is needed for this recipe, but it is easiest to make this recipe in its full measure and freeze the second cake for a later use.
2.the boiling water, chocolate and butter together until melted (it will be visibly grainy) and set aside.
3.the egg, sugar and vanilla until the mixture doubles in volume (about 2 minutes on high speed) and then fold in the chocolate mixture by hand.
4. Sift the flour, baking powder, baking soda and salt over the batter and fold in, then stir in the hot coffee (this will make the batter become fluid). Divide the batter evenly between the 2 pans.
5. Bake the cakes for about 25 minutes, until a tester inserted in the centre of the cake comes out clean. Allow the cakes to cool completely in the pans.
6. For the mousse, have ready a 9-inch springform pan, lining the bottom with parchment paper (in order to make the mousse-filled cake easier to remove from the pan).360ml of the cream until it holds a medium peak when the beaters are lifted and chill.
7. Heat the remaining 360ml of cream to just below a simmer and then pour it over thechocolate. Let this sit one minute, then gently stir until incorporated. Set aside.
8. Place the egg yolks in a bowl andfor a minute on high speed. Place the sugar and water in a small saucepot over high heat and boil (occasionally brushing the sides of the pot with water) until it reaches 120°C on a candy thermometer. Start the egg yolks on medium speed and then carefully pour the hot sugar down the side of the bowl to avoid splashing, and then increase the mixer speed until high and until this has doubled in volume and cooled to about 40°C (just above body temperature).
9. Measure the temperature of the ganache to ensure it is close to 40°C as well, and fold the ganache into theyolks. Let this cool for 15 minutes, or until just above room temperature, then fold in the chilled cream in 2 additions.
10. Pour half of the mousse into the ungreased springform pan.one of the cake layers in half horizontally and place this over the mousse, as centred as possible. Pour the remaining mousse over the cake layer and gently place the other half of the cake layer on top, pressing gently just so the mousse covers the sides of the cake, but not so that it sinks in. Wrap the pan in plastic wrap and freeze the cake to set it, at least 4 hours, or overnight.
11. While the cake is setting, prepare the glaze. Bring the water, sugar, and cream to a boil in a medium saucepot. Once boiling,in the cocoa powder and simmer (reducing the heat if needed) for 4 minutes, stirring often, (the consistency will not change). Remove from heat. Soften the gelatin in 60ml of cold water and then this into the hot cocoa mixture until dissolved. Cool the glaze to room temperature, then chill completely, at least 3 hours.
12. To finish the cake, remove it from the freezer invert the pan onto a cooling rack placed over a parchment-lined baking tray. Use a hair dryer on a low, hot setting to gently warm the pan so that it releases from the pan, the sides first and then the top. Warm the chilled glaze whileoccasionally until just melted and smooth and pour this over the torte, spreading gently with a spatula to ensure that it covers the top and sides of the torte evenly. Chill the cake for at least 30 minutes, then lift it onto your presentation plate and store chilled until ready to serve.
13. The cake will keep, refrigerated, for up to 4 days.