Banana cream pie

1. Whisk the sugar, cornflour and salt in a pan, then the milk and yolks. Cook, stirring, until very thick and bubbling for a minute.
2. Stir in the butter and vanilla. Press cling film onto the surface and cool for 20 minutes.
3. Layer half the bananas in the pie shell, add half the custard, then the rest of the bananas and custard.
4. Chill for at least 4 hours, then top with the whipped cream.

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