– First slice off the root and tip on the onion.
– Then halve it lengthwise and remove the outer skin.
– Then make slices from the root to the tip, leaving a little bit intact at the root end.
– Then, starting at the tip end, slice across these cuts, leaving you with chopped onion!
ETA: My sister tells me that she does this a little differently. She leaves the root end intact then proceeds as above. Since the layers remain joined together the onion won’t slip or separate out and there’s less risk to your fingers.