Soak porcini mushrooms in 200 ml water for about 20 minutes. Pour off, squeeze out, chop coarsely. Knead with dumpling dough, egg yolk and finely chopped chives. Form a roll (approx. 36 cm long) on some flour and cut into approx. 18 slices.
Fry in hot clarified butter in portions on both sides until golden brown.