In addition, I'll tell you a Shangqiu specialty "Slag cake" that can't be bought. It is baked from broken mung beans in a flat pan, and it is usually eaten during the Chinese New Year. Generally speaking, old people like to make it because it is delicious. But nowadays young people rarely make it. Because its technology is more complicated, most of the products sold in the market are made of corn flour, and the taste is much different from that of soybeans. If you want to eat authentic "dregs cake", you'd better go to Shangqiu's countryside and visit a more traditional home. Only in this way can you eat authentic "dregs cake".