Turn the heat on and cover the pot with a tight fitting lid. When the water comes to a boil, turn it down to a simmer for 10 minutes. The mushrooms will give off their liquid and literally make their own soup.
For every 2 cups of liquid, add 1 tsp. each of salt and sugar and 1 tbsp. soy sauce.
Add 4-5 scallions, sliced thinly, and 1/3 cup shoestring potatoes.
The soup is finished when the potatoes are cooked.
