Onions are plants that absorb sulfur from the soil as they grow. This is a chemical stored within the onion’s cell walls (or membranes). When those membranes are broken by our knives, they release a numerous enzymes and a chemical called amino acid sulfoxide into the air.

These react with the water on the surface of our eyes to create sulfuric acid. Our body is wired to flush out unwanted chemicals or particles from our eyes with tears, so the second our brain senses that pain, it sends the signal to start tearing up.

How-To-Cut-an-Onion-WITHOUT-Crying.-Why-Do-Onions-Make-You-Cry

  • How to Cut Onions Without Crying

General Tips:

Always use a sharp knife. The more efficient your chop, the less time you’ll spend exposed to those burning vapors. A sharp knife will do less damage to the onion cells themselves, and slice through them rather than crushing them and releasing more chemicals into the air.

Keep your chopped onion pieces face down and away from your work space. It can really make a big difference.

 

Try to leave onions in their original position as much as possible when you cut them, so that you don’t increase the surface area of exposed onion flesh. For example, when you first cut your onion in half, make sure both halves are placed cut-side down on the board. And don’t peel that section until you’re ready to cut into it!

Source: http://www.themagicoflife.info/

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Onions are plants that absorb sulfur from the soil as they grow. This is a chemical stored within the onion’s cell walls (or membranes). When those membranes are broken by our knives, they release a numerous enzymes and a chemical called amino acid sulfoxide into the air. These react with...