Pouring tofu is actually called tray tofu. At that time, the price of tray tofu was reasonable and the people could afford it. Especially the river workers who work by the canal like to eat hot, tender and nutritious tofu, which has become the hope of people who work on the dock for a day. It's also a race against time for everyone to bend over and leave after dinner. In order to get a good job, it has long been dubbed "pouting tofu".