Soak mushrooms in 2 cups of warm water for about half an hour and remove the stems (reserve the water). Place into a bowl and add scallion, ginger, salt, sugar and 1 cup of reserved mushroom water (or soup stock). Steam 20 minutes.
Remove the button mushrooms from can. Heat 3 tablespoons of oil. Fry the but ton mushrooms. Add 1 cup of soup stock, 1 teaspoon of