Wakame わ かめ is one type of edible seaweed commonly used in Japanese cooking especially in soup or salad (sunomono 酢の物). Wakame can be bought fresh or “nama” 生 (available only seasonally in Japan–not here in the U.S.). Other preparations are salt preserved or “enzou” 塩蔵, and dried or “kansou” 乾燥. Except for fresh wakame, all others are first briefly boiled (which turns the natural brown color of wakame to the green we are familiar with), then, either salt-preserved or dried. The dried variety is most commonly available here in the U.S. and its shelf-life is very long. It is also very convenient (just put it in a soup or hydrate before use) but it lacks flavor and texture. Since it is next to impossible to get fresh wakame, the next best thing is to salt-preserved wakame especially if you are a wakame connoisseur.
I just made my ususal sunomono with salt-preserved wakame, cucumber and diced (or concasse of) tomato. For dressing, you could use bottled sushi vinegar, “sanbai-zu” 三杯酢 (you mix rice vinegar 3 tbs, soy suace 1 tsp, salt 1/3 tsp, and sugar 1/2 tbs), or Ponzu shouyu ポン酢醤油 (from the bottle). You could also make sumiso 酢みそ dressing if you like. I used sanbai-zu. Sometimes, I also add a small amount of good olive oil or sesame oil to make it interesting. Since I had a small piece of tarako omelet left over, I also added the slices.