| THE
ART OF NATURAL BREWING |
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| Natural Brewing
Process |
The natural brewing of soy sauce is accomplished
in three distinct steps: koji-making, brine fermentation
and refining. Click here to
view the Kikkoman natrually brewed soy sauce production
chart.
1. Koji-making: To
begin the process, carefully selected
soybeans and wheat are blended under
precisely controlled conditions. Next,
a proprietary seed mold is introduced,
and the mixture is allowed to mature
for three days in large, perforated vats
through which air is circulated.
2. Brine Fermentation: The
resulting culture, or koji, is then transferred to
fermentation tanks, where it is mixed with saltwater
to produce a mash called moromi. The next, and perhaps
most critical step, is allowing the moromi to ferment
for several months using osmophilic lactic acid bacteria
and yeasts. During this time, the soybeans and wheat
are transformed into a semi-liquid, reddish-brown "mature
mash." It is this fermentation process that creates
the many distinct flavor and fragrance compounds that
build the soy sauce flavor profile.
3. Refining: Following
the months of moromi fermentation,
the raw soy sauce is separated from
the solids by pressing it through layers
of filtration cloth. The liquid that
emerges is then refined, pasteurized
and packaged as finished soy sauce.
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| Non-Brewed Process |
Producing
non-brewed soy sauce is an entirely different
matter. Soybeans are boiled with hydrochloric
acid for 15 to 20 hours. After most of the amino
acid is removed, the mixture is cooled to stop
the hydrolytic reaction. The amino acid liquid
is then neutralized, pressed through a filter,
mixed with active carbon and purified through
filtration.
Color and
flavor are introduced to this hydrolyzed vegetable
protein mixture by adding caramel color, corn
syrup for sweetness, and salt. The mixture
is then refined and packaged.
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