My Aunt insisted that when you chopped the root end of the onion it caused the tearing up. She advised to always start with the other end and to go quickly when cutting near the root end. She also advised disposing of the root end as soon as they were cut off to prevent fumes. I used to have problems with tearing before her advice and not since. That was close to 40 years ago. If you cut it like the video posted here and ensure the root is the last attached part and then throwing away the root right away, it works perfectly.
My Aunt insisted that when you chopped the root end of the onion it caused the tearing up. She advised to always start with the other end and to go quickly when cutting near the root end. She also advised disposing of the root end as soon as they were cut off to prevent fumes. I used to have problems with tearing before her advice and not since. That was close to 40 years ago. If you cut it like the video posted here and ensure the root is the last attached part and then throwing away the root right away, it works perfectly.