For 250 grams of salted mushrooms (or 50 grams of dry): 1 onion,
1-2 tablespoons of vegetable oil,
Rinse the salted mushrooms, drain the water, chop finely. Chop the onion
lightly fry in vegetable oil, cool and mix with mushrooms,
add a little pepper.
(Caviar is prepared from boiled dry mushrooms in exactly the same way.)
for a more pungent taste, you can add lemon juice or vinegar.