PURPOSE: To obtain a novel instant MISO soup having good shape retention of hard solidification, improved rapid preparation of momentary dissolution, having a good taste free from offensive smell, by adding a specific amount of water to MISO, lyophilizing it.

CONSTITUTION: 100pts.wt. MISO is blended with 210W280pts.wt. water, and if necessary, seasoned with dried bonito, Lentinus edodes, sodium glutamate, etc., mixed with a proper amount of ingrediens, prefrozen, and lyophilized in a vacuum, to give the aimed solid, block, instant MISO soup.

EFFECT: Since the MISO soup is processed into a solid, block state, MISO soup containing corbiculas with shells, which could not be made, can be prepared. Ingredients are not packed separately, several kinds of ingredients are uniformly mixed, molded into a lamellar state,lyophilized, and each fixed amount of MISO soup can be used as a cut solid ingredient, so it has uniformity in kind and weight, and this process is industrially advantageous.