Nước Tương Lên Men Tự Nhiên is a naturally fermented soy sauce produced by the Vietnamese company Hồng Đức. The product was developed using a fermentation method based on the experience gained by the company’s director while studying food microbiology in Japan. Hồng Đức began producing this type of soy sauce in 2002 following the introduction of stricter European and Australian standards for products made from hydrolyzed vegetable proteins. The soybeans are fermented naturally without using acid to break down their proteins. The recipe also contains sugar, vinegar, monosodium glutamate as a flavor enhancer and sodium benzoate as a preservative. Therefore, the product is not made exclusively from soybeans, water and salt although its base is naturally fermented. The sauce has a dark brown color, a liquid consistency and a pronounced fermented soybean aroma. Its flavor is salty and rich in umami with mild sweetness and acidity derived from sugar and vinegar. It can be served as a dipping sauce or used for marinating, cooking, baking, frying and preparing vegetable dishes. Intended for everyday use, it is an industrial soy sauce made with a naturally fermented base.