Pot helmets are made from regular dough and cake germ. Helmets are a little different from pancakes in that they are strictly two pieces of pastry together, and the reason for the bulge is that the two pieces of pastry have yeast in them as well as being coated on both sides with oil or dry flour, and the center of the helmet naturally expands through yeast fermentation as well as the principle of heat expansion and cold contraction.

There are many kinds of pot helmets, in the north, pot helmets are also called pot kui, dry buns, is Shaanxi, Gansu and other northern regions of the specialties of pasta, northern pot helmets are thick and round, like a pot lid, was originally a grandmother to the grandson's gift of the full moon in ancient times, and later because of the ease of consumption, without additional food, and no need for tables and chairs can be eaten on the go, and easy to carry, and became the rations of the soldiers of the ancient war with the ration. Gradually developed into a convenience food for the masses.