Dried mushroom soup with black flossy moss and dried oysters

Ingredient

1 pork trotter
20g dried black mushrooms
60g dried oysters
5g black flossy moss

Seasoning

Some salt
Method
Scald and rinse the pork trotter.
Soak dried mushrooms in water until soft. Cut off the stems
Soak dried oysters until soft. Rinse to remove sand.
Soak black flossy moss in 1 cup of water with some oil until soft. Wash
Boil 12 cups of water over high heat. Add pork trotter, dried black mushrooms and dried oysters. Then turn to medium heat and simmer for 1 1/2 hours. Add black flossy moss and boil for 15 minutes. Serve.