Lemon (Latin scientific name: Citrus limon) is a small evergreen tree of the citrus genus in the Rutaceae family. It is warm in nature, tolerant to shade, and afraid of heat. The fruit is yellow oval, mainly used for squeezing juice, and sometimes used as a cooking seasoning, but it is basically not used as fresh food because it is too sour. Lemon was brought to Europe by the Arabs. There is no record in the ancient Greek and Roman documents. It was only grown in Genoa, Italy in the 15th century. It appeared in the Azores in 1494. Because it is rich in vitamin C, it solves the problem of Westerners. The fatal problem of long-range navigation-scurvy, was used by the British Navy to supplement vitamin C. Lemon is one of the least hardy types of citrus. It is suitable for places where the winter is warm, the summer is not too hot, and the temperature is relatively stable. Originated in Southeast Asia, the main producing areas are now the United States, Italy, Spain and Greece.

Suitable for the crowd: the general population can eat. It is especially suitable for people with heat, dry mouth, irritability, indigestion, vitamin C deficiency, pregnant women with restless fetal movement, patients with kidney stones, hypertension, and myocardial infarction.

It is also used as a cooking seasoning, but it is basically not used as fresh food because it is too sour. Lemon was brought to Europe by the Arabs. There is no record in the ancient Greek and Roman documents. It was only grown in Genoa, Italy in the 15th century. It appeared in the Azores in 1494. Because it is rich in vitamin C, it solves the problem of Westerners. The fatal problem of long-range navigation-scurvy, was used by the British Navy to supplement vitamin C. Lemon is one of the least hardy types of citrus. It is suitable for places where the winter is warm, the summer is not too hot, and the temperature is relatively stable. Originated in Southeast Asia, the main producing areas are now the United States, Italy, Spain and Greece.

Efficacy and function: Taste sweet and sour, smooth in nature, enters the liver and stomach meridian; has the effects of resolving phlegm, relieving cough, promoting fluid, and invigorating the spleen; treating bronchitis, whooping cough, vitamin C deficiency, heatstroke, polydipsia, loss of appetite, stomach of pregnant women Disharmony, acceptance, anger, etc. 1. The appetizer for promoting body fluid and relieving heat does not look at the sour and slightly bitter taste of lemon food. It cannot be eaten raw like other fruits, but lemon peel is rich in aromatic volatile components, which can promote body fluid, relieve heat, and appetite and refresh the spleen. The summer heat and dampness are severe, and many people feel tired. After working or studying for a long time, they often have a poor appetite. Drinking a glass of lemon soak in water will refresh your mind and open your appetite. In Western food, lemon is often used as a seasoning for seafood to remove fishy odors, while Southeast Asian dishes are cooked directly to highlight its sweet and sour taste. Lemon is a condiment in the roast duck and roast goose that people in southern my country love to eat. 2. Prevent cardiovascular disease. Lemon is rich in vitamin C and vitamin P, which can enhance the elasticity and toughness of blood vessels, and can prevent and treat hypertension and myocardial infarction symptoms. In recent years, foreign studies have also found that green lemon contains a component similar to insulin, which can reduce abnormal blood sugar levels. 3. To clear away heat and resolve phlegm, lemon can also remove phlegm. 

The effect of phlegm is stronger than that of citrus. The summer weather is hot and humid. If you don’t pay attention to your diet, the internal humidity of the human body and the external humidity of the natural climate interact with each other, and the dampness and stagnation can produce phlegm over time. Therefore, when there is a lot of phlegm in summer and the throat is uncomfortable, add lemon juice with warm water and a small amount of salt to smoothly cough up the thick phlegm that has accumulated in the throat. 4. Antibacterial and anti-inflammatory lemons are rich in vitamin C, which acts like natural antibiotics on the human body. It has antibacterial and anti-inflammatory effects and enhances human immunity. You can drink more hot lemonade to maintain your body. 5. Beauty fruit lemon contains many nutrients such as vitamin B1, vitamin B2, vitamin C, and is also rich in organic acid, citric acid. Lemon is a highly alkaline food with strong antioxidant effect, which promotes skin It is very effective in metabolism, delaying aging and inhibiting pigmentation. 6. Antiemetic fruit "Cantonese", a traditional Chinese medicine work in Guangdong and Guangxi, records: "Lemon is suitable for mothers and children, and tastes extremely sour. Pregnant women are fond of liver deficiency, so they are suitable for mothers. When they are ripe, people bid for them. Still, juice can be substituted for vinegar.” In other words, pregnant women can put some lemons by the bed, get up in the morning and smell them, which can eliminate morning sickness.

 Nutritional value: 1. Fresh lemon has very low calories and is rich in citric acid. It is an excellent source of potassium, calcium, iron, vitamin C and bioflavonoids. 2. The bioflavonoids of lemon juice are much lower than that of fruits, because they are mainly present in the skin and membrane of the fruits. 3. Lemon peel contains equivalent citral, which is an aldehyde that is opposed to the effects of vitamin A. You must ensure that the supply of vitamin A in the diet is sufficient before you can eat a lot of lemon peel. 4. Lemon is rich in vitamin C and vitamin P, green lemon contains an ingredient similar to insulin.

Purchase: 1. Look at the color of the fresh lemon. The color is very bright, bright yellow, and the color will be very even, not yellow-green distribution, the skin is shiny, the knot on the top is green, which is the original one. The place where the tree connects will usually leave a small green top after it is picked, just like a pimple on the top of an orange. If it is brown, it proves that the lemon is not fresh. 2. Try to feel firmer, harder ones are more sour, and softer ones will be less sour, but don't buy soft ones, soft ones are very stale. 3. The overall shape is rounder, it will be less sour, but the juice will be a bit more; while the sharper shape will be more sour, but the juice will be less.

 Storage: 1. Preservation of cut lemons: lemons that can't be eaten at a time after being cut can be sliced and pickled in honey, and then taken out to soak in water for drinking. It can also be sliced and pickled in rock sugar or white sugar, or used to soak in water. However, you must ensure that you do not bring water with both, otherwise you may rot the squeezed lemon juice. 2. The preservation of lemon juice: It can be stored in the refrigerator with the mouth tightly sealed, and the time is limited to 3 days. If it grows longer, it will cause the volatilization of vitamin C. You can also buy some fresh lemons to squeeze the juice when a large number of lemons are on the market. Pour the lemon juice directly into the ice tray and store it in the freezer compartment of the refrigerator. When you need it, just take the lemon ice cubes and use it. 3. Preservation of intact lemons: Intact lemons can be stored for about one month at room temperature. If lemons are stored for a period of time when the oxygen concentration is lower than 3% and the carbon dioxide concentration is higher than 10%, the flavor will be adversely affected. More than 10% carbon dioxide can increase the decay of lemons and reduce the sourness. Oxygen below 5% can cause lemons to taste bad. You can wrap the lemons in plastic wrap and put them in the refrigerator. This is the simplest and easiest way.

Edible method: Because it is too acidic and not suitable for fresh food, it can be used to garnish and squeeze juice. Common usage: 1. Fresh lemons for direct drinking: Wash the fresh lemons, cut them horizontally into 2mm thick slices, and put them directly after removing the seeds. Pour cold water into a cup, add an appropriate amount of rock sugar and drink. 2. Making candied lemons: Wash the lemons, slice them, and remove the seeds. According to the ratio of 1 kg of lemon slices to 2 to 3 kg of sugar, use a layer of lemon and a layer of sugar into a porcelain jar or bottle and seal it tightly. You can drink it after one week (diabetic patients can use salting, the method is the same as sugar, the amount of salt is 25-30% of the amount of lemon) 3.Lemon for cooking: cooking food with a stinky smell, you can use fresh lemon slices or Put the lemon juice in the pot before starting the pot to remove fishy and greasy. 4. Lemon fresh fruit beauty: Wash the lemon slices, put it in cold water for 3~5 minutes, then it can be used to apply face, wipe body, and wash hair. Long-term use can dissolve the stains on the face and body, and achieve the effect of hair like a waterfall of ink, face like jade, body like fat, and radiant. 5.Lemon deodorization and preservation: Put 2~3 kilograms of fresh lemon fruits naked in the refrigerator or indoors, which can play a better role in removing the odor in the refrigerator or indoors; the slices are placed in the kimchi jar, which can remove whiteness and make the kimchi crisp. tasty.　Therapeutic methods: 1. Lemon horseshoe soup prevents cardiovascular disease. Use 1 fresh lemon sliced with skin, 5 horseshoes (water chestnuts) peeled, cook the soup together, and drink once a day. Middle-aged and elderly friends often drink it, which can prevent high blood pressure and improve the symptoms of patients with myocardial infarction. 2. Honey lemon tea is appetizing and thirst quenching. Squeeze the juice from fresh lemons with the skin and brew it together with tea juice. It can be used as a health drink for the treatment of summer heat and polydipsia. 3. Lemon sugar cane hydrolyzed wine to clear heat. Use 60 grams of fresh peeled lemon and 250 grams of fresh sugar cane, chopped and slightly pound, twist the juice and take it slowly. Used for excessive drinking, heat accumulation and body loss, upset and thirsty. 4. Honey lemonade relieves cold and throat discomfort. At the beginning of a cold, use a lemon, slice it with the skin, and add a small amount of honey to make a drink to relieve sore throat and reduce dryness and itching discomfort in the throat. Fresh lemon peeled and mashed, soaked in boiled water as a tea, can cure pharyngitis.