8 clementines
1 clementine, juice only
1 tsp baking powder
175g/6oz golden caster sugar
75g/2¾oz caster sugar
50g/1¾oz cocoa powder
pinch salt
125g/4½oz self-raising flour
½ vanilla pod, split in half lengthways and seeds scraped out
50ml/2fl oz orange liqueur
175g/6oz butter, softened, plus extra for greasing
40g/1½oz butter
200g/7oz crème fraîche
3 medium free-range eggs
100ml/3½fl oz orange juice