4-5 bananas, peeled and cut into 2cm/¾in chunks.
1 orange, zest only (optional)
pinch ground cardamom (optional)
100²µ/3½´Ç³ú caster sugar
50²µ/1¾´Ç³ú caster sugar
3 tbsp cocoa powder
1 tsp cornflour
75²µ/2¾´Ç³ú butter, plus extra for greasing
250ml/9fl oz double cream
4 free-range egg yolks
250ml/9fl oz full-fat milk
375g/13oz block puff pastry