Workers make soy sauce surrounded by hundreds of jars filled with fermenting rice and soy beans using a 'secret' age old recipe that has been passed down by generations in Vietnam. Famously named 'Ban' soy sauce, after the village in the Hung Yen province, its 'secret' partly comes from the use of rainwater or water from a borewell to wash and soak the rice.

The rice is then cooked so it becomes sticky before it is scattered onto a large, bamboo flat basket and dried in an airy...
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