How to Chop Onions
Most chefs cut onions in a very specific fashion—its similar to the technique here with one difference. They make a horizontal cut into the onion halves. It puts your fingers at risk and no one’s ever given a good reason for making that extra cut—except that it’s how they were taught in culinary school. Here's an equally effective way to chop onions.
Cut off the stem and just a little of the root. Then set the onion up on one of the cut ends.
Slice the onion from end to end. Now it’s easy to peel. Place peeled halves cut-side-down.
Make parallel cuts. Don’t slice through the root end—it holds the onion together.
Slice across the cuts you just made. The natural sections of the onion fall apart in small pieces.