Many housewives encounter situations when opened canned goods begin to spoil quickly.
To delay this process, you can resort to one amazing life hack.
The lid trick
This life hack is suitable for sterile containers stored in the refrigerator.

Open the jar, then apply a little regular mustard to the lid. Then don't forget to close the lid. Due to its properties, mustard will slow down the spoilage process of the product.
Brine
Some housewives resort to brine with mustard.
This brine is suitable only for vegetable preserves. It will not only help preserve the products for a long time, but also add a touch of piquancy to the taste.
Take one teaspoon of dry mustard and then add it to the open jar of product.
By using these tricks, you will keep opened canned goods fresh for a long time.
Previously, we talked about using a microwave oven for other purposes.