If you are looking for a real Shanghai experience, then ask a local about Dazhaxie or local river crabs. Shanghainese go absolutely insane over these delicacies every autumn. The Chinese have a saying that female crabs are to be eaten in September and male crabs in October. This saying has to do with the amount of yellow (the eggs of the female) and paste (white matter in the male) in the crabs. The crabs of Chongming Island in the Yangzi River and Yangcheng Lake in Jiangsu province are relatively famous in the Shanghai area. The larger crabs are boiled in large pots and smaller crabs are cooked in a coating of flour or in a red sauce.