Also known as smooth surface. Folklore calls October of the lunar calendar Xiaoyangchun, and Shanghai slang takes ten as Yangchun. In the past, this kind of noodles sold for ten pence per bowl, so it was called Yangchun noodles. Kaiyang onion oil noodles, also known as laver onion oil noodles. Stir-fried with scallion oil and thoroughly cooked dried seaweed (known as Kaiyang in Shanghai) and cooked noodles. Noodles are tough and smooth, dried seaweed is soft and delicious, and scallion oil is fragrant. After 1945, there was a vendor named Chen in the Chenghuang Temple who cooked noodles with scallion oil according to the daily practice of his hometown in northern Jiangsu. Onion has a strong and unique fragrance, which is very popular and has been passed down to this day. Now it is the specialty snack of lakeside snack bar.