If you want to make cold wakame, you need to iron it in addition to soaking it. If you don't scald it, the Undaria pinnatifida will have a fishy smell and taste bad. If you scald it, you can remove the fishy smell. Generally, it doesn't take too long to iron, but it can be scalded in boiling water for about 2 minutes.

Undaria pinnatifida burns easily. Clean, cut into pieces, soak in clean water 10 minute, then fry in boiling water for 2 minutes, then take out cold water to cool, then add your favorite seasoning and stir.