Pure milk, plain yogurt, sugar (the ratio of pure milk and yogurt is 5: 1, and sugar can be more or less according to personal taste).

working methods

1. Prepare containers, fresh-keeping boxes or sealed bottles of finished products, wash them, scald them with boiling water and dry them for later use.

2. Put the milk and sugar into the pot, heat it to a slight boiling point on a low heat, and then leave the fire, constantly stirring during the period to avoid pasting the bottom.

3. When the pot wall is not hot, add the original yogurt and stir well.

4. Pour it into a container, wrap it in a towel and put it in a warm place to ferment until it is sticky.

5. Keep it in the refrigerator and freezer, carry it with you, and use a clean and oil-free spoon when taking it.

skill

1, milk is heated to a slight boiling point for disinfection, so that the shelf life of the finished product is longer. If the amount is small, it can be heated to a temperature that is not hot, and yogurt can be added directly.

2. The reason why the tepid temperature is emphasized is that this temperature is the most favorable for fermentation. If the temperature is too high, the bacteria will die, and if the temperature is too low, the fermentation time will be too long.

3, the amount of sugar added according to personal preferences, like sweet, more sugar, like sour, less sugar.

4. In the process of fermentation, it is best for inexperienced friends to observe the fermentation frequently to avoid over-fermentation. If you find that there is a transparent liquid in the top layer of the finished product, it is over-fermentation and the milk is clear. You must immediately move the yogurt into the refrigerator and mix it evenly when you eat it.

Many children's shoes ask about fermentation time and answer this question: fermentation time varies with temperature. In the environment of more than 30 degrees in summer, the fermentation time is two or three hours, and the room temperature is about 20 degrees in winter, so it can be placed at room temperature for one night.

5. If the room temperature is too low, it is not conducive to fermentation. You can put yogurt in a slightly heated microwave oven, oven or rice cooker, or even a slightly heated steamer, but pay attention to controlling the temperature.