Clean the hijiki thoroughly, briefly blanch it in boiling water, and drain the water.
Blanch the tofu in boiling water, then cool it in a strainer.
Place the prepared hijiki and tofu in a bowl and mash the tofu.
Add chopped green onions and minced garlic.
Season with soy sauce, sesame oil, and ground sesame seeds, then mix well.
Transfer to a plate and sprinkle with whole sesame seeds to finish.