Place the milk, cream and the vanilla pod and seeds into a saucepan. Bring gently to the boil, then remove from the heat and remove the vanilla pod.
Whisk the sugar and egg yolks together in a large bowl until pale and frothy. Pour the egg mixture over the milk and cream and whisk together. Pour the mixture into a clean saucepan and whisk over a low heat until a thick custard is formed.
To serve, pour into a jug.