Onions grow underground. Therefore, nature has provided onions with a defense mechanism against pests and other organisms that destroy them. When the cells of the onion are cut or cut, a series of reactions begin and a new compound called 'syn-propanethiane S oxide' is formed. When this comes into contact with the aqueous layer of the eye, it produces mild sulfuric acid. This is how the eyes burn. This occurs not only in humans but also in animals. Before cutting onions, put them in the freezer for about 30 minutes. Because when cold, the activity of the enzymes that cause chemical reactions slows down.
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