Make pickling liquid using rice wine vinegar, sugar, salt and water. Bring to boil and set aside.
Meanwhile, slice radish and shallots thin on a mandolin. Pour boiling pickling liquid overtop and drizzle with sesame oil. Allow to cool to room temp before refrigerating. Next, slice scallions very thin into a container, grate ginger using a microplane and mix with canola oil, soy sauce, sherry vinegar and sesame oil. Set aside to marinate.
Put mayo into a bowl, add in miso paste and whisk vigorously until incorporated. Drizzle in black vinegar to adjust acidity. Transfer to squeeze bottle. Set up a breading station with the seasoned flour and the eggs. Dip marinated chicken thigh into the flour, then egg, then flour again. Set aside.
In a dry frying pan, toast sesame seeds until fragrant, set aside to cool.
In a sauce pot, fill half way up with canola oil, turn on medium heat. Add in garlic, green onions and ginger. Cook until tender. Add in spices - Sichuan peppercorns, cassia bark, star anise. After fragrant whisk in doubanjiang and turn off heat to infuse.
After 25 minutes, remove the star anise and cassia bark, blend mixture in a mixer until smooth. Keep warm in pot.
Preheat fryer oil to 350F. Working in batches, fry chicken thigh in the hot oil until very crispy and cooked through or internal temp reaches 160F. Transfer to rack and dunk fried chicken in warm Sichuan oil, be sure to coat it well. Transfer to resting rack and season well.
Assemble the dish with the fried chicken on the bottom, squeeze dots of aioli onto the chicken, followed by ginger scallion sauce, radish and shallot pickle and then top with toasted sesame seeds.