1 tsp baking powder
225g/8oz caster sugar
30g/1oz cocoa powder
275g/10oz self-raising flour
450g/1lb plain chocolate, around 40% cocoa solids, broken into pieces
175g/6oz chocolate balls
8 chocolate truffles, roughly chopped
450ml/戮 pint double cream
300ml/陆 pint double cream, whipped to soft peaks
4 large free-range eggs
1 tbsp milk
4 tbsp cream liqueur