Question

How a onion gives more taste in any food item​

Answer 1

Answer:

It's because onions really form the bedrock of our cooking. ... Cooked onions give dishes a rich umami flavor and a subtle sweetness — you don't always know onions are there once the dish has been spiced and sauced, but you'd definitely miss them

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Answer 2

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Intelegant Question : -

Onions have a unique chemistry with molecules that contain a whole lot of sulphuric compounds. Sulphur is responsible for those pesky tears that pop up anytime you chop an onion, but it is also responsible for flavor and odor.

The scientific name for this group of compounds is thiosulfinates.

Thiosulfinates are more flavour full Compounds It's Could Be An Artificial Compound or Natural Compound.

As It's Onion Is Natural So Its Give It A Most Favourable Taste.

When U Cook Onion With Some Tasteful Spices It's Give A Another Level, And When Some Taste It It's Give Him/Her Specific Favourable Taste.