To provide rod-like dry noodles can be eaten by only soaking the dry thin noodles into hot water, similarly provide dried cereals as well as an ingredient for instant noodles by lyophilizing bivalves.

Raw noodles in a raw noodle state of the thin noodles prepared by kneading wheat flour, common salt, edible vegetable oil and starch by adding water to be noodles are put into a high temperature and high pressure cooker, steamed at high temperature and high pressure and vacuum dried. Dried cereals are similarly prepared. Ruditapes philippinarum is brought to be an ingredient for the instant noodles and the like as bivalves instantaneously and widely opening the valves vertically by using a shrink packing unit.