Add potatoes, season to taste, and mix well. Rinse, cool, drain and squeeze out water. Chop finer if you want. Saute onions in oil and add to sauerkraut. Season with pepper to taste.
Chop prunes very fine and add honey to taste.
Continue simmering until beans are tender. Drain if necessary and set liquid aside for later. Mash beans well, adding bean liquid a little at a time until it is of a thick consistency. Crush garlic and stir into beans. Saute onions in oil and put on top of beans before serving.