In a pot, put the milk, the vanilla seeds and the vanilla pod. Bring to a simmer.
In a large bowl, mix together the egg, the sugar and the flour, until light and creamy.
When the milk starts to boil, remove it from the stove and sieve it over the egg mixture.
Mix for 1 minute, then put it back on the stove, over medium heat. Keep mixing until it thickens. When it starts to boil, remove it from the stove.
Cover it with plastic film and let it cool.
Bloom the gelatin in cold water for 5-10 minutes.
Dissolve the gelatin over low heat and pour over the pastry cream. Mix to combine.
In a bowl whip the whipping cream until stiff peaks form.
Fold the whipped cream into the pastry cream mixture. Set aside until ready to use.