Pour the hot milk in a very thin, steady stream into the egg mixture to temper the yolks. Return the mixture to the pan and, stirring constantly over low heat to make sure the mixture doesn’t catch at the bottom or curdle. Once the mixture has reached 180F on a digital thermometer, place the pot in a large pan or sink full of cold water, stirring the custard to cool it down.
Keeping the vanilla bean pod in, scrape the mixture into a container, cover, and refrigerate over night. Don’t skip this step! It’s the part that ages the ice-cream and intensifies the flavor.
The following day, remove the vanilla bean (make sure you get all the seeds in there) and blend the mixture with an immersion blender. Strain through fine mesh sieve, then churn in an ice cream maker per the manufacturers instructions.