Boil the mushrooms, chill and chop fine.
Boil and dice the eggs.
Dice the tomatoes and sauté slightly in some oil.
Cut the onions into rings and sauté in the remaining oil.
Dice the pre-soaked herrings.
Sieve the cottage cheese.
Combine all the ingredients, mix in the sour cream and garnish with herrings, eggs and greens.
