The blast furnace biscuit is also a kind of walnut cake. The so-called blast furnace is originally a hanging furnace, and there is also a chicken nest furnace. This cake is mostly made of fermented noodles, the enamel core is wrapped, the flowers are rounded, and then the sesame paste is baked on one side. After maturity, the outside is crisp and tender, the color is brown, and the aroma is overflowing.