Southern banana pudding

1. Whisk the sugar, cornflour and salt in a pan, then whisk in the milk and egg yolks.
2. Cook over a medium heat, stirring constantly, until thick and bubbling. Off the heat, stir in the butter and vanilla. Cool.
3. In a dish, layer wafers, banana slices and custard. Repeat to fill the dish, ending with custard.
4. Top with the whipped cream and a few crushed wafers. Chill for at least 4 hours so the wafers soften.

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