Black fungus and mushroom chicken soup is one of the soup ingredients I often prepare. I suggest that the landlord add some other fresh mushrooms besides mushrooms, such as Flammulina velutipes and Hericium erinaceus. Don't put too much, and don't put chicken essence monosodium glutamate, just put salt. Soup tastes as fresh as monosodium glutamate water! Might as well try.