Caotou Quanquan is a famous Han dish that is full of color, flavor and flavor, and belongs to Shanghai cuisine. The color of this dish is dark red and green, the rings are crispy, soft and cooked, fat but not greasy. It is a very popular delicacy in the Shanghai Haipai menu. Shanghainese can now eat this dish all year round. In the past, this dish could only be eaten when it was on the market in Caotou. Caotou is a sentence Shanghai local gossip, in fact its scientific name is alfalfa.