Cut the liver into small pieces and then finely puree in a blender. Add the eggs and the spices. Finally add the flour and make a spaetzle dough that is not too firm.
In the meantime, bring the water to the boil, season it with plenty of salt and press the liver spaetzle dough (using a spaetzle press) into the simmering cooking water. Let boil briefly and when the spaetzle rise, scoop out of the water and drain in a sieve.
Heat the butter in a pan, brown the finely chopped onion, add the spaetzle and fry as desired. A bowl of salad tastes good with it.