1, prepare skim milk, sealed utensils cooked and dried at high temperature, lactic acid bacteria (yogurt can also be bought), and refrigerator.

2. Heat and disinfect the milk in water, quickly cool it, put it in a sealed container, and put it in the bought yogurt to seal it.

3, put it in the refrigerator, pay attention to the temperature can not be too low, 5 degrees Celsius will do. You can also put it in the rice cooker. Pay attention to control the temperature in the ventilated place. If the temperature is too high, the yogurt will be very sour and wait for fermentation.

It can be taken out in about 4, 15 hours. Note that the longer the time, the more sour it is. You can add honey and sugar to taste.

Note: If the yogurt bought as a strain is the latest date, please buy active lactic acid bacteria products. Sterilized yogurt is useless. Pay attention to the production date and product type of packaging.