When a recipe calls for an assortment of diced vegetables, like carrots, celery, garlic, and onions, chop the onions last. This is especially important if you are prone to crying when slicing onions.
The onion's chemicals will leave a natural residue in the air and on the cutting board and knife. The minute diced onions hit the pan, however, the enzymes that produce the tear-inducing gases are destroyed. The less time between dicing and cooking onions the better.
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