A short look through the kitchen cupboards produced a open glass of yoghurt, some boiled potatoes form our Lunch and a leftover of whole rye flour. Together with a little spoonful of sourdough (a idea I copied from Günther Weber) I kneaded them to a dough and let them rise over night. The next morning I formed and baked some rolls from this dough which rose highly while we splept.
The rolls I served shortly later for breakfast had a soft, fluffy crumb and a great complex flavour. A great roll for breakfast or brunch!