8 clementines
1 clementine, juice only
1 tsp baking powder
175g/6oz golden caster sugar
75²µ/2¾´Ç³ú caster sugar
50²µ/1¾´Ç³ú cocoa powder
pinch salt
125²µ/4½´Ç³ú 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
40²µ/1½´Ç³ú butter
200g/7oz crème fraîche
3 medium free-range eggs
100ml/3½fl oz orange juice