Did you know that the acid in onions that makes your eyes burn is water soluble? This is the same acid that bites when you eat raw onion. So, if you want raw onion in a salad or on a sandwich or burger (etc.) but you want to skip the bite, slice or chop the onion and soak it in cold water for about 5 minutes. Rinse, drain and add to your salad or sandwich. The onion will be much milder and some onions, such as red onion, actually become sweet. Crunchy, sweet and delicious. Chances are, your non-onion people will become onion enjoyers after this.
Sliced onion in a bowl of cold water is easy to drain but chopped onion can be a bit harder. To make it easier I put the chopped onion in a colander, then put the colander in the cold water. Simply lift the colander out of the water and you're set.