Try this method to cut and peel any sized onion in seconds!
Step 1

Cut an onion in half vertically.
Step 2

Place the two halves "cut side down" on the cutting board.
Step 3
Cut off the unusable portions at the top and bottom of each half.
Step 4

Peel back the top layer of each onion half. Your onion is now completely peeled!
Step 5

Rinse the onion halves under cold water to remove any peel residue. Rinsing also reduces the amount of residue that causes your eyes to water when handling onions.
Step 6

When an onion is halved, it is much easier to cut into thin slices.
Step 7

Turn your cutting board ninety degrees after slicing, and you can easily dice your onion as well.