The document discusses onions, which are widely cultivated vegetables across the world. Onions are biennial plants that are harvested annually. They grow to 15-45 cm in height and have bluish-green to yellowish leaves. Onions are fleshy, hollow, and cylindrical with one flattened side. While the origin of onions is uncertain, they have been cultivated for thousands of years in places like Central Asia, Persia, China, Egypt, and Rome. Fresh onions are composed of 89% water, 9% carbohydrates, 1% protein, and negligible fat. They contain low amounts of nutrients but varying levels of phytochemicals depending on the variety. Cutting onions can cause eye irritation due to a volatile gas

1. OnionOnion

2. OnionOnion
The Onion is also known as fresh onion orThe Onion is also known as fresh onion or
bulb onion. It is a widely cultivated vegetablebulb onion. It is a widely cultivated vegetable
across the world. The onion plant is one ofacross the world. The onion plant is one of
biennial plant and harvested as an annual.biennial plant and harvested as an annual.
There are several variety of onion plant growThere are several variety of onion plant grow
to a height of 15 to 45 cm. The leaves areto a height of 15 to 45 cm. The leaves are
bluish green to yellowish. Onions are fleshy,bluish green to yellowish. Onions are fleshy,
hollow, and cylindrical, with one flattenedhollow, and cylindrical, with one flattened
sideside

3. History of OnionHistory of Onion
There are some uncertainty of onion origin.There are some uncertainty of onion origin.
But according to archaeologists, botanists,But according to archaeologists, botanists,
and food historians, the first cultivation ofand food historians, the first cultivation of
onions in Central Asia or Persia. Thousandsonions in Central Asia or Persia. Thousands
of years back in China, Egypt and Persia,of years back in China, Egypt and Persia,
onions are used in food as ingredient. Thereonions are used in food as ingredient. There
are a lot of evidence proof that onions areare a lot of evidence proof that onions are
used in China, Rome and Egypt.used in China, Rome and Egypt.

4. Composition of Fresh OnionComposition of Fresh Onion
We discuss the composition of fresh onion which isWe discuss the composition of fresh onion which is
as follows:as follows:
NutrientsNutrients
Fresh onion contains about 89% water, 9% carbohydrates (includingFresh onion contains about 89% water, 9% carbohydrates (including
4% sugar and 2% dietary fibre), 1% protein, and negligible fat (table).4% sugar and 2% dietary fibre), 1% protein, and negligible fat (table).
Fresh onion contains low amounts of essential nutrients. It has anFresh onion contains low amounts of essential nutrients. It has an
energy value of 166 kJ (40 Calories) in a 100 g (3.5 oz) amount.energy value of 166 kJ (40 Calories) in a 100 g (3.5 oz) amount.

5. Composition of Fresh OnionComposition of Fresh Onion
Phytochemicals
Phytochemical contents are vary according to variety of freshPhytochemical contents are vary according to variety of fresh
onion.onion.

6. Composition of Fresh OnionComposition of Fresh Onion
Eye irritation
After cut the fresh onion, often cause a stinging sensation onAfter cut the fresh onion, often cause a stinging sensation on
eyes which cause to uncontrollable tears. Because fresh onioneyes which cause to uncontrollable tears. Because fresh onion
release a volatile gas, syn-propanethial-S-oxide, whichrelease a volatile gas, syn-propanethial-S-oxide, which
stimulates nerves in the eye creating a stinging sensation. Butstimulates nerves in the eye creating a stinging sensation. But
eye irritation can be prevented by cutting fresh onions undereye irritation can be prevented by cutting fresh onions under
running water.running water.

7. Varieties of Fresh OnionVarieties of Fresh Onion
●
Brown Fresh OnionBrown Fresh Onion
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Green Fresh OnionGreen Fresh Onion
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Red Fresh OnionRed Fresh Onion
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White Fresh OnionWhite Fresh Onion
●
Yellow Fresh OnionYellow Fresh Onion

8. Brown Fresh OnionBrown Fresh Onion

9. Green Fresh OnionGreen Fresh Onion

10. Red Fresh OnionRed Fresh Onion

11. White Fresh OnionWhite Fresh Onion

12. Yellow Fresh OnionYellow Fresh Onion

13. Thank For VisitThank For Visit
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