In a small saucepan, whisk the egg yolks, sugar and sea salt into a smooth paste. Gradually whisk in the cream and milk until fully incorporated. Slice the vanilla pod in half, lengthways, and scrape the vanilla seeds into the saucepan. Add in the pod for maximum flavour.
Place the saucepan over a low-medium heat, stirring continuously for 8-10 minutes, until t