Remove moisture from the tofu and mash it.
Slice the green onion thinly, and finely chop the onion.
Heat cooking oil in a pan and stir-fry the onion and green onion.
Add the mashed tofu and sauté together over medium heat.
Season with soy sauce, mirin, a little sugar, and pepper.
Serve the stir-fried tofu over rice.
Finish by drizzling tsuyu, sesame oil, shredded seaweed, and chopped green onion.