How to Peel an Onion Quickly
To peel an onion quickly, start by cutting it in half vertically. Then, place the halves cut-side down and cut off the tops and bottoms. Finally, peel off the top layer of each onion half. If there's any leftover residue from the peel, run the onions under cold water to rinse it off.
Cut an onion in half vertically.  Place the halves "cut side down" on the cutting board.  Cut off the unusable portions at the top and bottom of each half.  Peel back the top layer of each onion half.  Rinse the onion halves under cold water to remove any peel residue. Rinsing also reduces the residue that causes your eyes to water when handling onions. When an onion is halved, it is much easier to cut into thin slices.  Turn your cutting board ninety degrees after slicing, and you can easily dice your onion as well.  Preheat a frying pan.  Cut the onion in half. Cut off the unusable parts (top and bottom). Stab the cut side with a fork. Hold the skin side against the base of the warming frying pan. Wait until the papery part of the skin loosens. Lift the onion right and and you'll be able easily pull off the skin. 
Cut an onion in half vertically. Place the halves "cut side down" on the cutting board. Cut off the unusable portions at the top and bottom of each half. Peel back the top layer of each onion half. Rinse the onion halves under cold water to remove any peel residue. When an onion is halved, it is much easier to cut into thin slices. Turn your cutting board ninety degrees after slicing, and you can easily dice your onion as well. Preheat a frying pan. Cut the onion in half. Stab the cut side with a fork. Wait until the papery part of the skin loosens. 