The collection and consumption of wild vegetables in our country has a long and storied history. Today, with their rich nutrition and delicious taste, they have become an important member of the green food family and a new favorite on people's dining tables. However, how can we properly protect this new favorite to maintain its freshness and nutritional value? Please see the editor's introduction below!
1. First, take a resealable bag and cut off the two bottom corners. Place the vegetables inside, rinse them gently with water. The water will flow out through the two cut corners, washing away the dirt. Rinse again with fresh water, then drain all the water. Squeeze the air out of the bag with your hands, seal the opening, and place it in the refrigerator. This can keep them fresh for a long time.
2. After being picked, wild vegetables will wilt, soften, lose their green color, their crispness will decrease, and they will become fibrous. The following preservation techniques will yield good results. Wild Vegetable Preservation Technique for Crispness: Calcium ions can combine with pectic acid in wild vegetables to form a sticky calcium pectate, preventing the vegetables from softening. It also inhibits water loss, preventing cellulose from lignifying, thereby maintaining crispness. Calcium can be obtained from calcium chloride, calcium carbonate, alum, etc., with calcium chloride being the best option.
3. Wild Vegetable Preservation Technique for Maintaining Green Color: Chlorophyll is prone to forming pheophytin in acidic conditions. Therefore, controlling the pH (i.e., a neutral to slightly alkaline pH of 7.4-8.3) can inhibit the loss of green color. The specific method is: dissolve baking soda, soda ash, or caustic soda in clear water to adjust the pH to 7.4-8.3, then soak the wild vegetables in this solution for 3-5 hours. Afterwards, rinse and drain with clean water. It should be noted that calcium forms insoluble calcium salt precipitates when it comes into contact with water and carbon dioxide, so the crispness and green color preservation must be carried out in separate steps.
4. Wild Vegetable Preservation Technique by Salting: Salting can serve as a long-term preservation method. The specific operation is: completely soak the wild vegetables in saturated saltwater. If the wild vegetables being processed are fleshy and juicy, the saltwater should be replaced after 3 days. After salting, the wild vegetables can be preserved in the saltwater for several months or even years. Since a lot of salt is absorbed into the vegetables, they can be soaked in fresh water before consumption to reduce the saltiness to a palatable level. In addition to salting, methods like blanching in boiling water and quick-freezing can also be used for preservation. However, these methods are not as effective as salting in preserving the original nutritional value and palatability.