When buying onions choose those onions that are firm and dry with shiny, thin paper-like skins. They should not have mould growth nor should they have sprouted.
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The onion is a vegetable most common in every cuisine around the world. It is the bulb of the onion plant that is used as a vegetable. Onion belongs to the same family ( Allium) as shallot, garlic, leek, and chive. These vegetables are known for their pungent flavor. The onion plant consists of green hollow leaves growing upwards and a bulb at its base which swells with time, it also has compressed, underground stems. It also produces pink or white coloured flowers on its stalks. There are fleshy scale-like leaves that surround a central bud at the tip of the stem. At the time of harvest, the plant dies and the outer layers of the bulb turn dry, then it is harvested, dried further and made ready for use. Onions have different varieties that differ in size, shape, color, and flavor. The most commonly available ones are red, yellow, and white onions. The varieties of onions may vary in taste too from sweet to spicy and pungent, determined by the season in which they are grown. Onions add much flavour and aroma to various vegetables and meat preparations. They are also valued for their medicinal properties. Onion cultivation originated in India and then slowly spread across the world. China is the biggest producer of onions globally.