Prepare the Gelatin
In a small bowl, sprinkle gelatin over cold water and let it sit for about 5-7 minutes to bloom (soften).
Heat the Cream Mixture
In a saucepan, combine heavy cream, whole milk, and sugar. If you're using a vanilla bean, scrape seeds into the mixture and add the pod as well. Heat gently over medium-low heat, stirring occasionally, until sugar dissolves completely. Avoid boiling.
Combine Gelatin and Cream
Remove the cream mixture from heat and discard the vanilla pod if used. Stir in the bloomed gelatin until fully dissolved. Add vanilla extract if you're using that instead of a bean. Stir gently to combine evenly.
Pour and Chill
Divide the mixture evenly into ramekins, glasses, or molds. Let them cool slightly before refrigerating. Chill in the refrigerator for at least 4 hours, ideally overnight, until set.
Serve
To serve, dip each ramekin briefly into hot water to loosen the edges, then invert onto serving plates. Alternatively, serve directly in attractive glasses or cups. Garnish with fresh berries, fruit compote, or even chocolate shavings if desired.