1, boiled peanuts are dried in water first, then dried or roasted with fire, put into a collection bag and stored in a dry place.

This is a dehydration process, and food does not need to be preserved or refrigerated. When food absorbs water, it will return to its original state and taste. This method can be used to preserve various foods. Freeze food in the refrigerator, take out the air in the refrigerator and the ice will evaporate. This process is called quick freezing and drying.

3. This process is to dry frozen food by moisture sublimation under low pressure, and sublimation is the process of turning ice bricks into water vapor without going through liquid state.