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1. Safe Food Preservation Methods
1.1. Freezing Method
Freezing is the most widely used method for preserving food. Nowadays, refrigerators come with separate freezing and cooling compartments suitable for different types of food. For businesses, there are large refrigerators or freezers to accommodate larger quantities of food. Typically, freezing food reduces the temperature to 0 degrees Celsius or lower, halting the activity of microorganisms and extending the shelf life of food.
1.2. Vacuum Sealing
One of the alternative methods for food preservation is vacuum sealing. In this method, the food is placed in a sealed bag or container, and then all the air inside is removed. This environment deprives bacteria of oxygen, preventing them from thriving and thus helping to preserve the food. Vacuum sealing has become popular among many home cooks in their kitchens.
1.3. Canning and Bottling
Today, many types of fruits and vegetables are preserved by canning or bottling. These containers are sterilized to eliminate bacteria and ensure cleanliness, and then the food is carefully packed inside. Different foods require different levels of preservation; some may even require a final step of pressure canning.
However, once these preserved foods are opened, they should be consumed promptly as bacteria and microorganisms can quickly spoil them.
1.4. Pickling
Pickling is also a common method of food preservation nowadays. Typically used for vegetables like cabbage, tomatoes, and cucumbers, pickling not only extends the shelf life of the food but also imparts unique, flavorful tastes, allowing for a variety of culinary creations.
Food can be pickled with saltwater, vinegar, alcohol, vegetable oil, olive oil, etc. However, for some types of food, pickling can make them harder to digest when consumed.
1.5. Smoking
Many families also use smoking as a method to preserve certain foods like meat or fish. Smoking enhances the flavor of the food and, with the combination of heat for drying without cooking and the addition of hydrocarbons from the smoke, helps preserve the food better. However, excessive intake of hydrocarbons, a component of smoke, can also be a carcinogenic factor in humans.
1.6. Drying
This is considered one of the oldest methods of food preservation still in use today. With this method, you can preserve various types of meats, fish, as well as vegetables, roots, and fruits. However, with drying, some vitamins in the food will be compromised and no longer remain intact as they were originally.
Vitamins A, E, or B will be lost if you dry the food under sufficient sunlight. Additionally, vitamins A, C, and E will be lost through oxidation during storage. Therefore, with this preservation method, you also need to consider certain foods that contain many valuable nutrients.
2. Preserving Fresh Foods
2.1. For Various Types of Animal Meats
When it comes to fresh animal meats, it's best to buy just enough for your daily meals rather than stocking up for freezing. If you'll be using the meat within 2 days, store it in a sealed container in the refrigerator's meat drawer.
But for longer-term storage, use the freezer compartment, ensuring to wrap the meat tightly with food wrap to maintain its moisture. For smoked meats or jerky, simply pack them in a sealed container and cover the top with a salt-soaked cloth to help regulate temperature and enhance flavor.
2.2. For Seafood
Seafood items such as shrimp, fish, squid, octopus, clams, mussels, and snails often carry a distinct oceanic scent. To reduce this odor and prevent it from spreading to other foods, wrap them in food wrap before storing in a sealed container. The best way to preserve seafood is to keep it in the refrigerator's chill compartment if you plan to use it within 2 days; otherwise, store it in the freezer section. Additionally, for certain types of fish, you may choose to precook before refrigerating to minimize the fishy smell and retain its nutritional value.
2.3. Fresh Milk
For natural fresh milk products, it's crucial to handle them carefully as they are prone to quick bacterial contamination and fermentation. Therefore, it's advisable to consume the milk once opened; if not finished, store it in a sealed container in the refrigerator's cool compartment. Use it within a day to prevent loss of nutrients present in the fresh milk.
2.4. For Various Vegetables
With clean, fresh vegetables, upon purchase, discard any leaves that are damaged or infested. Avoid soaking vegetables in water; instead, place them directly in ziplock bags or containers lined with paper to prevent moisture accumulation. If vegetables are washed but not dried properly, the cold environment may cause them to become soggy, wilted, and bruised. By following this method of vegetable preservation, you can keep them fresh for about 2 weeks.
2.5. For Different Fruits
For delicious, vitamin-rich fruits, you can store them directly in the fridge's cool compartment. However, if you want to extend their shelf life, place the fruits in ziplock bags or containers with moisture-absorbing paper lining at the bottom. Additionally, regularly check the refrigerator for any spoiled or bruised fruits to discard, as they can affect the integrity of other fruits and reduce the overall preservation time.
3. Preserving Dry Foods
3.1. For Various Dried Seafood
Dried seafood such as dried squid, dried fish, or dried shrimp... should be sun-dried for about 2 to 3 hours after purchase to ensure they are thoroughly dried. Then, wrap them in newspaper and finally place them in a nylon bag, tightly sealing it. Store in the freezer compartment of the refrigerator at a temperature of -18°C. Because dried seafood contains little moisture, storing them in a low-temperature environment will help them become more flexible and tasty.
3.2. For Different Types of Mushrooms
Preserving nutrient-rich fresh mushrooms is extremely simple. After purchase, place the mushrooms in a glass jar and seal it tightly. Alternatively, you can put them in a nylon bag, tightly seal it, and store them in a dry place or in the refrigerator's cool compartment. For dried mushrooms, simply soak them in water for about 10 minutes before use to soften, then cook them as usual.
3.3. For Bread
Preserving bread is simplest and longest by placing them in a tightly sealed plastic bag, ensuring no air gets in. However, you should only use bread within about 3 to 5 days of preservation. If left for too long, bread can become moist, moldy, and not suitable for consumption.
3.4. For Cheese
Premium cheese with delicious aroma is prone to melting at normal room temperature. Therefore, when purchasing cheese, it's best to cut it into portions for use within a certain period. Then, wrap it in wax paper and store it in the refrigerator's cool compartment. Avoid using plastic wrap for cheese as it can cause sweating and diminish the original flavor.
3.5. For Various Grains
Typically, nutrient-rich grains can be preserved for several months. However, to maximize their nutritional content, store them in glass jars with tightly sealed lids or in nylon bags tightly sealed. Then, keep them in cool, dry places or store them in the refrigerator's cool compartment.
3.6. For Dried Bamboo Shoots
To preserve dried bamboo shoots for an extended period while retaining their flavor to the fullest, place them in thick nylon bags and tightly seal them. Then, you can store them in the refrigerator's cool compartment or in cool, dry places to avoid moisture. As for precooked dried bamboo shoots, you can store them in the fridge for 2 to 3 days.
3.7. For Various Spices
Everyday cooking spices like onions, garlic, chili, ginger... should be placed in dry baskets or paper bags, not in plastic bags. Additionally, you can store them in the fridge's cool compartment and use them gradually.
Certainly, with the helpful information above, you've found the right and safe way to preserve food at home. However, you should also purchase and use organic foods on the day of to ensure better health and well-being for your family members.
