Place 18 cm circles of the chocolate sponge cake in rings for the finish.
Fill the rings to about half way with the chocolate mousse.
Add the frozen sea buckthorn centre, followed by the remaining chocolate mousse. Freeze.
Remove the entremets from the rings and cover with dark glaze and spray with a dark chocolate mixture (1:1) and cocoa butter to create a matte effect.
Decorate with chocolate decoration and physalis.