150g/5½oz plain flour
90g/3½oz caster sugar
1 cinnamon stick
1 tbsp cornflour
pinch of salt
150g/5½oz strong white flour
1 vanilla pod
100g/3½oz dark chocolate
250g/9oz unsalted butter
unsalted butter, for greasing
100ml/3½fl oz double cream
2 free-range medium eggs
3 free-range egg yolks
250ml/9fl oz whole milk