Long-term preservation of the old soup requires constant boiling, and water needs to be added continuously during the boiling process, which can dilute the concentration of nitrite in the old soup. After continuous boiling, it is difficult for the bacteria inside to survive during the heating process.

How to preserve soup stock for a long time

Ordinary soup is recommended to be finished as soon as possible. What you can't finish can be sealed in the refrigerator and heated before drinking.

Although the broth has a strong taste, it has accumulated heavy metals, nitrates and high purines. Eating too much will do some harm to your health.