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Heating acids degrades them which reduces the amount of acid content when it breaks the acids down. So by cooking onions you are in essence reducing the acidic content, but you are also concentrating other flavors.

On a side note, if you are referring to reducing the eye irritation when cutting or bruising onions then that is a little different.

Onions contain sulfuric compounds that produce sulfuric acid when they waft in the air and make contact with the water in your eye. The sulfuric acid burns your eye and your tear ducts release tears to try and wash it out or dilute it enough to stop the burning sensation.

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14y ago

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