Boiling, high temperature treatment
Kill some microorganisms
Food can be kept longer
When the temperature returns to the greenhouse, the microorganisms will grow again
Short storage time
Vacuum packaging
Extract all the air in the package and seal it
Microorganisms cannot grow without air
Foods suitable for preservation in vacuum packaging include rice, tea, maize and peanuts
Dry Tibetan Method
Put the food in the sun to dry or air-dry
Reduce or remove the moisture contained in food
Longer storage time
Dried foods include dried chili, dried shrimp, dried squid, dried shiitake mushrooms, etc.
You can also put food in the oven, dehydrated in the food dehydrator
Dried fruits, vegetables, meat, etc. made by these appliances
Will not adhere to dust, more hygienic, and easy to carry
Canning and Bottling
It can isolate food from air and microorganisms
Some nutrients in food will be destroyed
Salted
Put a lot of salt
Salt allows the moisture contained in food to seep out
Kill microorganisms attached to the food surface