Hello, minced meat is more exposed to oxygen and microorganisms in the air than normal meat. Because of its large contact area, it is difficult to maintain. Warm and humid environment will accelerate its deterioration. Generally speaking, it should be stored in a ventilated and cool place, which can be stored for 1-2 days at room temperature and for about a week in the freezer. So I personally think that mildew is caused by improper preservation.

I hope it is useful to you, and I hope to adopt it ~