Its a known fact that onions are way too smelly and often make you cry while cutting them.The real struggle is staying 'tear-free' during the process of slicing and dicing the onions.
The only technique I know of which actually works for stopping the irritation of eyes when chopping onions is the use onion Protective goggles that feature a soft foam seal inside the frame to keep out eye-stinging vapors when chopping onions.Forget about all the other techniques like holding a wooden matchstick between your teeth,eating bread while slicing and dicing the onions.
Another method can be reducing the internal pressure of the onion cells prior to chopping them.I always put my onions in the refrigerator for 15-20 minutes,followed by quickly cutting the onions by a sharp knife and it works.
My neighbor prefers using only a sharp knife because it slices cleanly, rather than crushing the onion cells that contains juice and volatile compounds(Sulfenic acid ) known to cause irritation to one's eyes and sinuses.
And again,the easiest method is to just not look at the onions while chopping it. However,you have to be really sure of your knife skills
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