Every retail bottle of Kikkoman sold in the US is brewed in Walworth, Wisconsin. Has been since 1973. It's the highest producing soy sauce plant in the world. Before it opened, the soybeans and wheat were grown in America, shipped to Japan, brewed for six months, shipped back across the Pacific in bulk and bottled in Oakland. Kikkoman looked at that and built the plant in the middle of the soybean belt instead.
It's the same process as Noda, Japan, where the family has been doing it since the 1600s. Soybeans, wheat, salt, water, six months of fermentation.
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