The main ingredient of the sauce is soybean. The other ingredients are sticky rice and salt, while it is fermented in an enzyme known as koji punch

Soya sauce – a delicacy of Hung Yen.

Sticky rice, after being soaked in water and boiled, is spread out on bamboo tray, covered with the leaves of longan or sweet potato. The boiled rice is left for three days till it turns yellow with the fungus

Soybeans are soaked in water and dried before being baked well. The soybeans are then baked with sand at a low temperature till they turn yellow with a sweet smell, and then being soaked again for a week.

Fungus and salt is added, and the mixture is put in ceramic containers, covered tightly and dried in the sun for between two and six months. Experienced soya sauce makers sometimes leave it for up to two years.

During the drying period, makers should stir the mixture every two days, but just for a minute.

Sunlight is an important factor in the process. The more sunlight it gets, the better quality the soya sauce will be. From March to August is the main season for making soya sauce.

The final sauce should be a dark brown colour, with a slightly unpleasant odour but sweet taste. The sauce can last for up to three years in good conditions.

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Source: NDO/VNA