At the intersection of No. 217 Yan'an Road and Renhe Street in Hangzhou, there is a century-old pastry company, Caizhizhai. Near the Mid-Autumn Festival, the beloved of old Hangzhou locals ~ mustard moon cakes are on the market. For me, the first time I came to Hangzhou, the northerner, I heard that I tasted one with curiosity. Mustard moon cakes are not big, more than one yuan coins are limited, 3 yuan a, according to the salesman, there are fresh meat, egg yolks, Wuren moon cakes, a variety of, about 20 varieties, but locals have a special interest in mustard moon cakes. This is the different taste brought by regional differences.