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- Infuse the vanilla pod in warm milk for at least 30 minutes. Remove the vanilla pod from the milk and bring it to the boil.
- Place egg yolks and sugar in a bowl and whisk for 2 to 3 minutes. Pour the flavoured milk onto the egg mixture in a thin stream, whisking all the time.
- Pour the egg and milk mixture back into a heavy-based pan and continue to whisk constantly over medium heat until the mixture thickens. Test the consistency by running your finger through the custard on the back of a wooden spoon. It should leave a clear line.
- Cover and chill the custard overnight so that the flavours blend.