Tucked away on a busy street of Kennedy Town, Sun Hing is known for serving up heaping steamer baskets of fluffy char siu bao (barbecued pork buns), curried tripe, spare ribs, and Cantonese sponge cake to night owls starting at 3:00 a.m. every day. By the time the sun rises, the place is packed with customers ranging from elderly people sipping tea to students from the nearby university and still-tipsy revelers seeking late-night bites. Opened by Chui Hoi in 1973 and now run by his son, Sun Hing has become something…