Peel the bananas and place each on a piece of aluminum foil. Shape the foil into a cup and press the ends together. Drizzle 2 cl Grand Marnier and multivitamin juice over the banana per banana.
Halve the passion fruit and squeeze half a fruit over the banana for each person. Close the aluminum basket at the top and place on the grill for 10-15 minutes.
Beat the cream with the vanilla sugar until stiff. Remove the bananas from the grill, open the foil at the top and pour 1 tablespoon of cream on each of the bananas. Serve immediately!