Mix 3 tablespoons of milk, sauce powder and sugar. Bring the rest of the milk to the boil, stir in the sauce powder, bring to the boil again and chill. Wash potatoes thoroughly, boil in water and cook covered for about 25 minutes. In the meantime, wash and stone the plums. Drain the potatoes, rinse and peel.
Press potatoes immediately through a potato press into a mixing bowl. Add eggs, sift flour on top. Add salt. Knead well with the dough hooks of the hand mixer. With well floured hands (sticks a little bit) form 12 flat cakes, put one plum in each and form dough into a dumpling. Bring water to the boil in a large pot, simmer the dumplings in it at low heat for 18-20 minutes in two portions (until they float on top). Lift them out and let them drain well. Melt butter in a pan, add breadcrumbs and brown lightly over medium heat. Arrange the sauce and 3 dumplings on plates. Lightly dust the dumplings with icing sugar.
Lift them out and let them drain well. Melt butter in a pan, add breadcrumbs and brown lightly over medium heat. Arrange the sauce and 3 dumplings on plates. Lightly dust the dumplings with icing sugar. Add butter crumbs. Decorate with plums. Add remaining sauce extra