Salad sauce originated from Minorca Island in the Mediterranean Sea, and it is made of a lot of eggs and oil. This sauce has a long history in the diet. The consumption of salad dressing continues to increase.

Generally, the main raw materials of bottled salad dressing we buy are vegetable oil, egg yolk and brewing vinegar, plus seasonings and spices. Among them, olive oil is mostly used as vegetable oil in Europe, while soybean salad oil is widely used in Asia. After the oil and egg yolk are fully stirred, emulsification occurs and it becomes a delicious salad dressing. A small amount of vinegar mainly plays an antibacterial role, so salad dressing generally contains no preservatives and can be regarded as a "green food".