Pour 200 ml of boiling water over dried porcini in a bowl and soak for about 20 minutes. Wash the chives, shake dry and cut into fine rolls.
Pour the mushrooms into a sieve, collect the soaking water and use it for other purposes (e.g. for the goose sauce). Squeeze the mushrooms and chop them coarsely. M
Form into a roll (approx. 5 cm Ø) and cut into approx. 18 slices.
Preheat oven (electric cooker: 100 °C/circulating air: 75 °C/gas: see manufacturer). Heat lard in a pan. Fry the cookies in it in portions on each side for approx. 2 minutes and drip off on kitchen paper.
Keep warm in the oven.