Classic Chocolate Cake

200g butter, cubed

200g dark chocolate, broken into small even sized pieces

30mls very strong coffee, like an espresso

95ml water

85g plain flour

85g self-raising flour

25g cocoa powder

200g brown sugar

190g caster sugar

¼ tsp bread soda

75ml buttermilk

3 eggs, lightly beaten

For the ganache

150ml cream

150g of dark chocolate, broken into small even sized pieces