4–5 bananas, sliced into 2cm/¾in coins
397g/14oz tin condensed milk
100²µ/3½´Ç³ú brown sugar
5 cardamom pods, seeds removed and crushed
30–50g/1–1¾oz chopped hazelnuts
75²µ/2½´Ç³ú butter
500ml/18fl oz double cream
500g/1lb 2oz block puff pastry