Divide the blood orange into donut-shaped molds and cover with the chocolate genoise, freeze.
Fill a donut-shaped mold with the chocolate mousse, place the blood orange into the center, cover with the chocolate mousse, genoise and freeze.
Unmold and cover with the dark glazing, used at 35°C.
Whip the orange ganache, pipe with a St.-Honoré nozzle onto the crispy bottom and spray with orange chocolate.
Place the cake in the center, decorate.