Preheat your oven to 180C/160C Fan, and line a 2lb loaf tin!
In a microwave proof bowl, add the chocolate and butter and heat and mix until melted. I usually do 30 second bursts!
Add the coffee granules to a mug, and pour over the boiling water and mix until smooth - add the coffee mix into the chocolate/butter and mix until smooth.
In a separate bowl, add the flour, cocoa powder, baking powder, bicarbonate of soda and sugar to a large bowl and whisk until distributed.
In another bowl, mix together the buttermilk and eggs.
Add the three mixes together - I pour the chocolate/coffee mix and the egg/buttermilk mix into the dry ingredients and fold until smooth. You do not need to use a stand mixer as you may over-mix it.
Pour the mixture into the lined 2lb loaf tin - bake in the oven for 55-60 minutes, or until baked through!
Leave to cool fully once baked!
For the Frosting
Make sure your butter is at room temperature!
Beat the butter on it's own for a few minutes to soften!
Add in the icing sugar and cocoa powder 1/2 at a time, and beat until combined.
Add the vanilla, and then the evaporated milk a little at a time beating fully in-between each go!
Decoration!
Slather the frosting onto the top of the loaf cake, and then decorate how you want - chocolates and more!