Step 1: Soak the gelatin in water.
Step 2: Gently heat the cream and milk with the sugar, seeds and vanilla bean, stirring until the sugar is dissolved.
Step 3: Remove from heat and add gelatin and stir with a whisk until completely dissolved. Strain through a sieve.
Step 4: Spread the mixture, let it cool and let it set in the fridge for at least 6 hours.