Preheat the oven at 180 °c. Sift the dry ingredients - flour, baking powder, bicarb, salt, cocoa powder - together. Beat the eggs with vanilla, add oil, milk and add to the dry ingredients. Pour the hot coffee next and mix till smooth.

Pour into 2 round springform greased or lined pans and bake for 20/25 mins. Lightly press down the top of the 1 cake layer to flatten and even it out. Let the cakes cool.
* use both layers to make a double-layered mousse cake or decorate the other layer as desired. In this recipe, I used 1 layer.

Add the cream and sugar in a mixer for the mousse.Whip together till it forms stiff peaks.In a separate bowl mix the cocoa with hot water.Melt the chocolate in the microwave and add it to the cocoa mixture and mix till smooth.Fold the cream into the chocolate mixture till combined.

Take 1 cake layer out of the tin. Spread half of the mousse at the bottom of the springform pan. Add the cake layer, spread the rest of the mousse on top and even it out. Cover the pan with cling wrap and freeze overnight or for 2hrs.

Pour the cooled chocolate ganache over the mousse and let it set in the fridge. Loosen the tin on the sides of the cake tin and place the cake on a flat tray. Decorate as desired *Alternatively loosen the cake tin, pour the ganache over to allow dripping and let it set in the fridge. Serve chilled