Slice the whole grapefruits in half and scoop the flesh into a blender (reserve the grapefruit shells for later). Blend the flesh until fully combined. Pour through a sieve into a container and add the gelatin sheets. Add the passion fruit purée and stir to combine. Meanwhile, combine the eggs and egg yolks in a medium saucepan.
Add the purée and sugar to the pan and place over medium heat, whisking constantly to keep the curd smooth. Cook until the curd has thickened to a velvety texture, about 5 minutes, then whisk in the vanilla seeds and pod. Whisk in the butter, then strain through a sieve into a bowl set over an ice bath. Whisk until cooled to room temperature.
Using a 2-ounce ladle, carefully pour into the grapefruit shells and place on a sheet tray. Refrigerate until chilled and set, about 2 hours.
Garnish with the grapefruit segments just before serving.
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