Bring the raspberries to the boil with two tablespoons of sugar, gingerbread spices and a little water and cook for half a minute. Then puree with the hand blender.
Stir cornstarch into two tablespoons of cold water. Mix the cornstarch with the raspberry mixture and cook for a minute. Then let it cool down.
Mix the sour cream with the remaining sugar (to taste).
Put one tablespoon of sour cream in each of 6 bowls and place one and a half speculoos on top, over two tablespoons of raspberry mixture, two tablespoons of sour cream and one speculoos. Then add two tablespoons of sour cream and top it with a speculoos.
The dessert should be left to stand in the refrigerator for at least 2 hours.
They can also be prepared with frozen forest fruits or strawberries.