All onions must be peeled before use to remove the papery skin. Here the technique of slicing a whole onion into rings is shown. For smaller, half-moon slices, cut the onion in half lengthwise, place cut-side down and cut into vertical slices.
Trim away the root end without cutting right through. Peel off the skin with a small knife.
Cut off the tough root end with a chef’s knife. Reserve for using in stocks.
Hold the onion on its side and slice downwards to form rings. Separate into individual rings, if you like.