Shijimi (freshwater clam) miso soup becomes really delicious and fragrant. if you use this simple trick it will definitely upgrade your shijimi soup, so please give it a try.
This is a really standard recipe. I think my mother taught it to me originally.
Take the time to de-sand the clams even if you get already de-sanded ones. Always taste how salty the clams are before adding the miso. I also have a recipe blog - please take a look! http://ameblo.jp/mint0323/
Enjoy Japanese food around the world.