Buttermilk, in Chinese, is called white skim milk, skim milk. It is a product left over after processing buttermilk from a type of full-fat cream, with a sour flavor and thicker. Often translated as buttermilk in China, it is much lower in fat than regular milk. Nowadays, buttermilk is mostly fermented to imitate the traditional flavor. It is widely used in cakes and breads. How to make buttermilk at home: Preparation: All containers should be boiled in boiling water to sterilize; and drained. Ingredients: 1cup fresh milk, 2teaspoons white vinegar (or freshly squeezed lemon juice, do not use concentrated lemon juice) Practice: add white vinegar (or fresh lemon juice) to fresh milk, stir to mix well, and let it stand at room temperature for 15-30min, or until the texture becomes thick. How to store: Store homemade buttermilk in a sealed container in the refrigerator. And it should not be kept for too long, about 1-2 days. It is best to use it up on the same day.Tips:It is recommended to use freshly squeezed lemon juice, it will be better. If you use freshly squeezed lemon juice, after squeezing the lemon juice, you need to strain the lemon juice through a sieve 1-2 times to filter out the broken pulp, leaving only pure lemon juice for use. Do not use commercially available lemon juice concentrate as a substitute for fresh lemon juice. buttermilk and yogurt: Buttermilk has a similar texture to our commercially available yogurt. If you don't want to make your own buttermilk, you can buy commercially available yogurt as a substitute for buttermilk, but when buying, pay attention to the ingredients in the recipe of the product you are buying to see if it is flavored yogurt. Most yogurt sold on the market is flavored because most of our citizens are not used to that particular sour taste. The so-called flavored products are made by adding honey or other ingredients to the yogurt to neutralize the original sour taste and make it suitable for public consumption. If you want to buy yogurt as an alternative to buttermilk, you can choose plain yogurt without honey or with a small amount of sugar. This can be changed according to your personal preference. Please use your own discretion