Beijing Longmen Vinegar Factory was founded in the Jiaqing period of the Qing Dynasty, and is still the only vinegar manufacturer in Beijing, and is currently affiliated to Beijing Ershang Golden Lion Longmen Food Co., Ltd. Longmen brand vinegar has been designated as a special product for the two sessions over the years, and at the same time supplied rice vinegar to people from all walks of life at home and abroad for the 2008 Beijing Olympic Games.
 
Longmen special rice vinegar is a well-known vinegar in Beijing, specially supplied to major hotels and restaurants, it takes rice as the main material, self-stepping brick koji as the starter agent, "self-stepping brick koji" is Longmen's self-made saccharification starter culture, pressed into "brick-like" by a variety of grains, compared with ordinary Daqu fermentation speed is slower, but the aromatic substances are released more thoroughly. After six years of microbial fermentation, the acidity of the vinegar reaches 6 °, the sour taste is soft and not choking, the aroma is different, with the special fragrance of rice, compared with Zhenjiang balsamic vinegar, the texture is thinner, not suitable for dipping, but the effect of cold dressing or marinated meat is better.
 
Longmen vinegar product layout is divided into four series: aged vinegar, rice vinegar, balsamic vinegar and smoked vinegar, rice vinegar is the main product, the overall acidity of other series of products is not high, the price is medium, the standard 480ml price is about 15 yuan, it is worth starting for daily use at home. Compared with national brands such as Hengshun, the production scale of Longmen is small, the product quality is decent, and Longmen rice vinegar is a good choice if you don't like too heavy feeling.