PURPOSE: To obtain a fibrous or granular processed food, by combining beans or grains as a raw material with a food additive alone or two or more thereof, adjusting the moisture to a specific value, and passing the resultant combined materials through a small gap between rotating grinder plates.

CONSTITUTION: Beans or grains as a raw material are adjusted to a moisture content of 30W60wt%, and then combined with a microbial protein, the skin of a citrus fruit, raw material for food, e.g. seaweed or vegetable, or a food additive, e.g. paste, chemical seasoning or spice, alone or two or more thereof. The moisture content is then adjusted to a range of 10W65wt%, and the resultant materials are passed through a very small gap between rotating grinder plates. Thus, the aimed processed food, e.g. snack, stock for OCHAZUKE (boiled rice with boiling hot water or green tea poured over it) or fish flour.