ウェブHSOUYU,SOY-SAUCE KANEIWA. The secret of this true Japanese treat , "Kaneiwa" shouyu, is that the sauce has been manufactured for about 100 years using the same process. Its fermentation method involves a special "鮗ケ" (Aspergillus Oryzae) that converts hard-to-digest soy proteins, starches and fats into "Moromi", which contains …