Ingredients
- 650g unsalted butter
- 650g plain chocolate (70% cocoa)
- 100ml very strong coffee- espresso is ideal
- 3 tsp vanilla essence
- 650g plain flour
- 2 tsp baking powder
- 2 tsp bicarbonate of soda
- 950g light soft brown sugar
- 10 eggs
- 2 x 284ml/9½fl oz soured cream