Milk mushrooms, especially black ones, themselves are very bitter due to the large amount of bitter milky juice. As a result of soaking, the juice and bitterness are gone, but the mushroom aroma and its crisp taste remain. In this recipe, you are encouraged to soak the milk mushrooms for a week before pickling and change the water 2-3 times a day, and then pickle in a 3-liter jar. Try it, the result is wonderful!