Great British Chefs demonstrates how to chop and dice an onion
How to dice and onion
1. Place half the onion, flat side down, on a chopping board
2. Slice the onion horizontally 3/4 of the way through
3. Slice vertically down into the onion at equal intervals, being sure not to cut all the way through into the root
4. Slightly turn the onion away from you, and slice through at equal intervals from front to back, discarding the root when finished.
5. Repeat with the other half of the onion