Hydrate gelatin in water.
Melt chocolate and set aside.
Mix passion fruit purée with sugar and eggs.
Cook gently until thickened (82°C), stirring continuously.
Strain and weigh 230 g, add gelatin and mix.
Pour in 3 additions over melted chocolate and emulsify.
Use an immersion blender to refine the texture, then add cubed butter gradually and emulsify until smooth.
Once at 38–40°C, pour 280 g over the set bavaroise.
Place the vanilla biscuit on top, press slightly, refrigerate 3 hours, then freeze for 24–36 hours.