Bring the blood orange purée to the boil together with the Campari, sugar, and water (1).
Mix the agar-agar with the citric acid and add it to the boiling mixture.
Boil for another 2 minutes.
Divide the blood orange jelly into silicone molds (small balls) that will fit into the panna cotta as a filling later.
Freeze.
Mix the gelatin powder with the cold water and allow to soak.
Heat the panna cotta mixture and mix in the pulp of the vanilla pod.
Add the gelatin mixture so that it melts.
Fill the panna cotta molds halfway with the mixture and place in the freezer for a short time.
Arrange the set blood orange jelly on top and cover with more panna cotta.
Freeze completely, then remove the panna cotta from the molds.
Allow the panna cotta to defrost on the plate.