Bloom the gelatin by placing it in a small bowl and stirring in 50mL whole milk. It will look a little lumpy, set aside to hydrate for 10 minutes.
Split the vanilla bean in half lengthwise with a knife. Use the knife to scrape out the contents. Combine 200mL whole milk, 400mL heavy cream, vanilla bean contents, vanilla bean pod, 1/2 tsp salt and 80g sugar in a pot. Heat over medium, stirring occasionally until steaming hot but not boiling.
Remove the milk mixture from heat and whisk in the bloomed gelatin mixture. Whisk until the gelatin has completely dissolved. Strain through a fine mesh sieve and pour into a large serving dish. Refrigerate for at least 4 hours to set, or make ahead and store wrapped tightly in the fridge for up to 3 days.