Soak the dried wakame in the water and let it soften up for 30 minutes. While waiting, you can prepare the other ingredients.
Finely chop garlic.
Toast the perilla seeds and grind them with a mortar and pestle.
Bring the submerged wakame and the water to a boil, and add garlic, and ground perilla seeds.
Optionally, you can add tofu for more protein. Cut the tofu into cubes and add the cubes to the soup.
After 5 minutes, you can add your soy sauce and soymilk or oat milk.
Taste and adjust the seasoning with more salt or soy sauce to your liking.