generous pinch bicarbonate of soda
300g/10陆oz golden caster sugar
3 heaped tbsp cocoa
2 tbsp cocoa
200g/7oz icing sugar
250g/9oz self-raising flour
1 tsp vanilla extract
caramel chocolate bar (king size)
2 tbsp mini marshmallows (optional)
250g/9oz butter
100驳/3陆辞锄 butter
splash of double cream
2 eggs, beaten
125ml/4录fl oz milk
250ml/8陆fl oz cola drink
2 tbsp cola drink