The use of defective apples to process fruit vinegar can improve fruit utilization, reduce production loss, and increase economic efficiency.

1. Fruits should first remove the worms and mash, and then wash them into wooden or stainless steel appliances.

2. Mix the bran into the crushed fruit, and use the raw material to squeeze out the water from the fingers. Then add 3% total bran to the mixed raw material, and pour it into a 1.0-1.5m high taro shape after mixing.

3, fermentation once a day 1-2 times the material temperature control at about 35 °C. When the temperature is low, the shed film can be used to cover the insulation. After about 10 to 15 days, the raw material emits aroma of vinegar. When the temperature drops at the same time, it is put into a ceramic jar and cooked after being stamped.

4, after vinegar cooked after 1 week, add the same weight as the water, soak 4 - 5 hours, then vinegar.

5. Bactericidal storage After the vinegar is poured out of the bottle, it is sterilized at 60-70°C for 10 minutes to be stored.

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