For the pumpkin cannelloni: cook the pumpkin (with peel) in the vegetable stock until tender. Blend the pumpkin and xanthan until smooth. Spread the mixture evenly onto cling film and bake in a preheated oven at 60 °C for approx. 60 minutes. Remove from the film and roll whilst warm. Allow to cool and fill with the fish cream. Serve with the smoked fish cream slices.