Onions may be grown from seed or very commonly from "sets". Onion sets are produced by sowing seed very thickly one year, resulting in stunted plants which produce very small bulbs. These bulbs are very easy to set out and grow into mature bulbs the following year, but they have the reputation of producing a less durable bulb than onions grown directly from seed and thinned.
Onions are one of the earliest crops mentioned in written text, in the Bible's Book of Numbers (11:5) as part of the Egyptian diet of that time. Six types of onions were known at the time of Pliny the Elder's Natural History.
Why do onions make you cry?
As onions are sliced, cells are broken open. Onion cells have two sections, one with enzymes called allinases, the other with sulfides (amino acid sulfoxides). The enzymes break down the sulfides and generate sulfenic acids. Sulfenic acid is unstable and decomposes into a volatile gas called syn-ropanethial-S-oxide. The gas then dissipates through the air and eventually reaches one's eye, where it will react with the water to form a mild solution of sulfuric acid. The sulfuric acid irritates the nerve endings in the eyes, making them sting. The tear glands then produce tears in response to this irritation, to dilute and flush out the irritant.
Canned onion Nutrition Facts: Calories, Carbs, and Health BenefitsTweet
Canned onion is 94.1% water, contains 4.02% carbohydrates, 0.09% fat, and 0.85% protein. One canned onion will give you with 2.533 grams of carbohydrates. It is equal to 1.95 percent of the 130 grams of carbohydrates you need on a daily basis. That same in an amount measuring 100 grams (3.5 Oz), canned onion provides 78 kilojoules (19 kilocalories) of energy and provides low amounts of essential nutrients, with only Vitamin B6 (pyridoxine) having a moderate percentage (10.54%) of the Daily Value. This means that if you add canned onions in your diet it will help your body to produce red blood cells (RBCs) and neurotransmitters, maintain metabolism of fats and carbohydrates into monosaccharides, decrease symptoms of premenstrual syndrome (PMS) (in females) and will be effective against mood disorders like depression, because vitamin B6 is responsible for creating neurotransmitters and regulates emotions through hormones like serotonin and dopamineAlzheimer’s disease with the help of other vitaminsmorning sickness during pregnancy in women. At the same time it contains an appreciable amount of Sodium attaining 24.73% of the Daily Value in a 100 g (3.5 Oz).