1. Peel the onions and wash them.

2. Use a kitchen knife to remove the head and tail. Cut the onion in half with a kitchen knife. Note that it is cut vertically, not crosswise. Then cut into strips starting from the edge according to the grain of the onion.

3. After a few cuts, a plane will appear. At this time, cut from the edge of the plane according to the grain. Follow the method of the first two steps, keep cutting according to the grain, and when cutting into a flat surface, start cutting from the edge until the cut is completed.