Thinly slice the mushrooms, garlic and onion. Dice the red pepper or chilli.
Heat the oil in a frying pan or wok over medium heat. Add the onion and stir-fry for a couple of minutes. Add the garlic, mushroom & red pepper, then cover. Turn down the heat and sauté for 5 minutes until the mushrooms have released some liquid.
Add the soy sauce, mirin, rice vinegar and beans, put the lid on and sauté for another 3-5 minutes over low heat until the vegetables are tender. Taste, and adjust to your liking.
Crumble the tofu on top and stir-fry for a minute.
Serve with the sesame seeds & nori scattered on top.