India Sambar

what is the botanical or scientific name for the small onion (chinna vengayam) grown in india?

in southern india, it is also called “sambar vengayam”

The scientific name is Allium oschaninii
( The shallot)

The varieties of crop plants ( Including onion ) are not given scientific or botanical names .

The onion that you have in mind is internationally known as

” Chinna vengayam ‘ OR ‘ Sambar vengayam’ as you have described. It is commonly called shallot.

The shallot is a relative of the onion, and tastes a bit like an onion but has a sweeter, milder flavor.

They are more expensive than onions and can be stored for at least 6 months.

Some say you can substitute about 1/2 the amount of finely-chopped onion (preferably red onion) and (optionally) add some garlic in place of shallots.

Unlike onions where each plant normally forms a single bulb, shallots form clusters of offsets, rather in the manner of garlic.

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http://www.answers.com/sambar%20vengayam

Sambhar deer bathing in wet mud!