1) wash the thick mouth glass bottle or porcelain bottle (canning jars can not be used because the mouth is too large prone to contamination of stray bacteria), full of milk, with clean double plastic film to cover the mouth of the bottle, and bundled with string, string bundling to be loose, because in the process of heating the bottle will produce a lot of

steam, such as bundling too tightly, the film will bulge through the prone to contamination.

2) the glass bottle containing milk into the pot to boil for 30 minutes, the water immersed in the milk surface is appropriate, do not cover the lid, and then remove

cooled to the back of the hand when touched not hot.

3) Pour 2% to 4% of the market fresh yogurt, such as Jiabao brand pure yogurt, Qinyong brand pure yogurt. Immediately after adding the bought

yogurt, tie the plastic film tightly to ensure an oxygen-free environment inside the bottle.

4) 10 hours at room temperature (30 ℃ above room temperature in summer can be), fresh milk emulsion coagulation as tofu brain, yogurt is ready.

5) Put the bottle of yogurt into the refrigerator at 0 to 5 ℃ for 2 to 4 hours, you can eat.

Sugar can be added at the time of sterilization, can also be added at the time of eating, the amount depends on personal taste, or not add.

Can make a separate small bottle, such as milk coagulation is very good, can be kept as a strain, but can not be used many times, because the home can not guarantee the aseptic operation,

strain into the freezer can be. If the bottle mouth film bulging, inside the gas production, that has entered the gas-producing bacteria, only edible,

can not be retained as a strain.