In a medium saucepan, combine heavy cream, sugar, and the scraped vanilla bean seeds with the pod. Heat gently until it just begins to simmer, then remove from heat and let it steep for 15 minutes to infuse the vanilla flavor.
Sprinkle the gelatin over water in a small bowl and let it sit for a few minutes. This step softens the gelatin and ensures it dissolves smoothly into the warm cream without clumping.
Reheat the cream mixture to a gentle simmer. Remove the vanilla pod and stir in the bloomed gelatin until fully dissolved. Be careful not to boil, or the gelatin may lose its thickening power.
Pour the mixture into ramekins or serving glasses. Let them cool slightly at room temperature before transferring to the refrigerator. Chill for at least 3 hours, or until fully set and firm.