3 egg yolks
2 tbsp cornflour
25g caster sugar
1. Heat the milk and any flavouring being used, until it just comes to the boil.
2. Whilst the milk is heating up, mix together the yolks, sugar and cornflour, it should look like a smooth paste.
3. Slowly add the warm milk to the paste & stir well with a whisk.
4. Put the mixture back in the saucepan and stir constantly with the whisk until the custard thickens.
On Britain's Best Home Cook I flavoured my custard with orange zest, but you could use any flavouring you want, such as lemon zest of vanilla.