Place cold water in a small bowl and sprinkle gelatin over the surface in a single layer. Be sure not to pile it as that will prevent the crystals from dissolving properly. Let stand for 5-10 minutes to soften.

Meanwhile, in a medium saucepan, heat cream, sugar on medium heat and bring just to a boil until sugar dissolves. Stir in gelatin and vanilla extract. Immediately whisk until smooth and dissolved. If the gelatin hasn’t fully dissolved, return the saucepan to the stove and heat gently over low heat. Stir constantly and don’t let the mixture boil.

Pour cream into individual serving dishes. Cover with plastic wraps and refrigerate for at least 2-4 hours, or until completely set.

Passion fruit sauce: cut the passion fruits in halves and remove the pulps using a spoon. In a small saucepan, bring 50 g sugar and the pulps to a boil. Remove from heat and puree the sauce with a hand blender, so that the flesh separates and the seeds remain whole. Stir in vodka if desired until well blended.