Crispy tofu Toss the tofu with soy sauce, sesame oil and cornflour. Heat a pan with oil and fry until golden and crisp on all sides. Remove and set aside.
Vegetables In the same pan, add a little more oil. Fry onion, carrot and mushrooms on high heat for 2–3 minutes — keep them moving.
Noodles Add udon noodles straight into the pan. Toss to loosen and let them pick up a bit of colour.
Sauce it Pour in light soy, dark soy, mirin and rice vinegar. Toss everything together — glossy, savoury, slightly sweet.
Finish Add tofu back in with spring onions. Toss once more, heat through, and turn off the heat.
Serve Finish with sesame seeds and a drizzle of chilli oil if you like heat.