Vacuum the parfait with the kombu and leave to infuse in the refrigerator for 24 hours.
For the caramel, boil the sugar with the sake and mirin until it caramelises.
Deglaze with the cream and reduce to a sauce. Add the miso, stir until smooth and leave to cool.
Pass the parfait through a fine sieve and beat until light and airy in a planetary mixer. Add some of the caramel sauce and the chocolate brownie.
Pipe the parfait into the cups and freeze.