Pat the tofu dry with a kitchen towel and mash it finely.
Prepare mixed-grain rice.
In a bowl, combine the mixed-grain rice, mashed tofu, salt, and sesame oil, then mix well.
Blanch the inari pockets in boiling water and squeeze out excess moisture.
Fill each inari pocket with a suitable amount of tofu mixed-grain rice and shape it.
Finish by sprinkling black sesame seeds or chopped green onions on top of the prepared inari sushi.