Sort the raspberries and wash them briefly. Beat the cream until it is almost stiff and finally stir in the mascarpone and powdered sugar (if you like) until creamy. Season with grated tonka bean. Chill the cream for at least 1 hour. Crumble the biscuits.
Layer alternately cream, raspberries and biscuits in thin layers in a decorative glass. Finish with a layer of cream and garnish with fruit.