at 40:00, the dim sum is called 蝦蛟 which is total different from 小蘢包 because this is from shanghai. 蝦蛟 is come from Guangzhou, and the soy sauce is not soy sauce is called 喼汁 is just a little bit salty plus sour, which is used when you eat beef meat ball for Fried spring rolls, that is almost no japanese knows that. hope can help you, welcome to hong kong!