Step 1

Cut off root end of the onion, leaving the root intact but removing the fine thread like roots and any dirt. Cut off stem end of onion. Cut onion in half root through stem. Remove outer layer of skin and any fibrous layer of onion. Clean cutting board.

Step 2

Lay onion cut side down with root end toward your non-dominant hand. Holding knife parallel to the cutting board, slide knife horizontally into the onion at 1/4-inch intervals (or larger if desired) almost to the root, but not through it.

Step 3

Turning knife so that it is perpendicular to the board, cut through the onion so the tip stops just short of the root end at 1/4-inch (or larger) intervals.

Step 4

Turn onion so that the cut end is facing your dominant hand, cut through the onion to create diced onion pieces that are square or cube like.