Bring a pot of water to a boil and add the salt. Gently add the whole block of tofu and boil for 5 minutes.
Let the tofu cool a bit until touchable. Tear into irregular bite-sized chunks.
In a bowl, toss the tofu with potato starch, chili powder, and salt. Drizzle with oil and toss again until evenly coated.
Air fry at 200°C (390°F) for 10 minutes, or until golden and crispy.
Mix gochujang, soy sauce, maple syrup, and rice vinegar in a bowl until smooth.
Add the hot crispy tofu to the sauce and toss quickly to coat.
Top with sesame seeds and spring onion. Serve fresh!
