1 tbsp red food colouring gel or about ¼ tsp food colouring paste
250g/9oz plain flour
2 tsp baking powder
1 tsp bicarbonate of soda
1 tbsp cocoa powder
300²µ/10½´Ç³ú icing sugar
250g/9oz light muscovado sugar
150ml/¼ pint sunflower oil
2 tsp vanilla extract
8 white chocolate truffle balls, to decorate
butter, for greasing
250g/9oz butter, softened
200ml/â…“ pint buttermilk
2 large free-range eggs
250g/9oz full-fat mascarpone