For the Hollersupp’n, first remove the seeds from the plums and chop them. Peel the apples and remove the cores, then cut them into slices.
Heat the butter in a pan until it foams. Add the plums, apples and well washed and drained elderberries, add sugar and sprinkle with cinnamon, stir gently and stew for about 20 minutes until soft.
Whisk the flour in the milk and pour it over the softened fruit. Bring everything to the boil, reduce the heat slightly and simmer the soup for another 5 minutes, then let it cool. Whip the cream and fold most of it into the cold soup.
Place the remaining cream as a whipped cream topping on the Hollersupp’n served in plates.