For an extra layer of flavor, consider adding a pinch of red pepper flakes to the sweet soy drizzle. If you don't have mirin, you can substitute with a dry sherry or rice wine vinegar, but add a touch more brown sugar to compensate for the sweetness. Feel free to customize this scramble with other vegetables like bell peppers, onions, or mushrooms. Just adjust the air frying time accordingly. For best results, use extra-firm tofu. It holds its shape better during cooking and yields a more satisfying texture.