Clean the mushrooms well. Barely cover with water in a saucepan. 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 have given off their liquid and literally made 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 thin and 1/3 cup shoestring potatoes.