When storing, be careful not to put Tieshan medicine in plastic bags, which are airtight, and don't wrap Tieshan medicine in newspapers. The lead in the newspaper will go deep into yam, which is not good for your health. Stored in a cool and ventilated place at room temperature, it can generally be stored for 3-6 months.
First, the most commonly used method of iron stick yam preservation
1, room temperature ventilation preservation method
Store in a ventilated place at room temperature, which can be stored for 3-6 months, usually in a balcony away from light. But be careful not to put iron yam in plastic bags, which is airtight; Don't wrap iron yam in newspaper, because the lead in newspaper will go deep into yam and be harmful to health. It can be wrapped in a napkin and stored in a ventilated, cool and dry place.
2, rice wine soaking method
The yam, which is temporarily inedible after being broken, is soaked in rice wine at the incision and then dried by a hair dryer to promote wound healing. After being wrapped in a napkin, it can be kept in a cool corner for several months. Fresh iron yam just dug out, because of the strong steam, the surface will be slightly wet. If you want to keep this yam, you need to dry it on the balcony before putting it away, but don't expose it to the sun or bake it. Be sure to put it in a cool and ventilated place.
3. Refrigeration method of refrigerator
The research shows that fresh iron stick yam can be stored for 3 years at 65438 0-4℃, so it can be stored in refrigerator. In order to keep the taste, it is best to keep it with skin, and don't wash the soil off the yam. When eating, you can keep the original flavor to the greatest extent, just wrap it in plastic wrap or put it in a sealed bag. Iron stick yam is best separated from fruit, because the fruit will release ethylene in the process of slow ripening at low temperature, which will lead to accelerated growth and deterioration of yam.
4, cold preservation method
The warehouse temperature should be set at 2-6 degrees, which is suitable for large-scale storage of iron stick yam.
5, block freezing method
Yam can be peeled and cut into pieces, then packed in plastic bags according to the approximate consumption each time, and then frozen in a freezer drawer. You don't need to thaw when eating, just boil the water to ensure that the nutrients of the iron stick yam are not lost.
Generally speaking, the storage environment of iron stick yam should be dry, ventilated, dark and cool. No matter how you do this, you don't have to worry about how to keep the iron stick yam.
Second, the method of identifying true and false iron stick yam
1, weighing
You can weigh yourself with an electronic scale. Iron stick yam is a good yam with sufficient powder, so there are tricks to distinguish between light and heavy. Touch by hand, if the weight of a single root is less than 200 grams, or it feels too heavy, it may not be an authentic iron stick yam, it feels too light, and it is not an iron stick yam.
Step 2 look at the appearance
Iron stick yam is usually uniform in thickness, with a diameter of about 1 yuan coin, slightly darker skin color and unique iron red spots on the rhizome; When buying yam, if you find that the diameter is very thick or the skin is very smooth, it means that it is not an authentic iron stick yam, but may be a vegetable yam or other varieties of yam.
Step 3 Knead by hand
Iron stick yam is different from vegetable yam. The real iron yam can't be crushed by any two fingers, and other yams can't be guaranteed. Perhaps this is one of the reasons why it is called "iron bar".
Step 4 steam it and taste it
Because iron stick yam has little water content and rich polysaccharide content, its juice is thick. Authentic iron stick yam can often be steamed in a short time (usually 5 ~ 10 minutes). After cooking, the taste is dry, greasy and sweet, and the taste is "sweet with sweetness", accompanied by a faint hemp taste. Fake iron yam takes a long time to steam.
Third, the medicinal value of yam
1, tonify the middle energizer, replenish qi and warm hands and feet
Yam, especially iron stick yam, has high nutritional value and is rich in more than ten kinds of amino acids and trace elements. Women with deficiency and cold constitution are prone to cold hands and feet in autumn and winter. Drinking yam black-bone chicken soup can invigorate qi and nourish blood and regulate the body.
2, nourishing the stomach, lowering blood sugar, moistening the fur
Compared with other coarse cereals, Chinese yam has smaller starch granules, less crude fiber content, easier digestion and absorption, and can also promote the proliferation of digestive tract mucosal cells. Yam can also reduce the absorption rate of fat and cholesterol in food, which has a certain hypoglycemic effect, and diabetics can also eat it with confidence.
reference data
Xinhuanet's "Eat these three foods healthily in autumn-eat more and keep fit" webpage link.