For the cream slices, first divide the puff pastry lengthwise, prick several times with a fork and bake until golden brown. Prepare the vanilla pudding according to the instructions, soak the gelatine in cold water, squeeze out and stir into the ready hot pudding.
Now stir in the sugar, the pulp of the vanilla pod and the rum. Let it cool down (stir again and again) until it starts to gel. Whip the cream until very stiff and fold it in.
Spread the finished cream on the puff pastry, place the 2nd puff pastry on top and smooth it out all around. Now spread with raspberry jam.
For the glaze of the cream slices, mix the powdered sugar and water well and smooth over the raspberry jam.