The day before you plan to make your miso soup, add the 200 grams Manila clams and 1 teaspoon of salt to a bowl and add just enough water to cover the clams. This will make the clams open and release any sand they contain. The next day, rinse the clams
200 grams Manila clams
Add the ½ package Japanese mushrooms, clams and 2 cups water to a small saucepan and bring to a boil. Cook until the clams open (about 1-2 minutes).
2 cups water, ½ package Japanese mushrooms
Turn the heat down and add the 1 ½ tablespoons miso, dissolving the paste in a ladle filled with a little soup first to avoid clumps. Because different types of miso vary in salinity, taste the soup and adjust the miso to taste.
1 ½ tablespoons miso
Finish by adding the 1 scallion and serve immediately.