Henan. Liangshiji flour is produced in Henan. Flour is ground from wheat. Depending on the protein content, it is divided into high-gluten flour, medium-gluten flour, low-gluten flour and 5-pound flour. Flour is the staple food in most parts of northern China. There are many delicacies made with flour, and the taste is also very rich. There are also many varieties of pasta in the south.