A tiny member of the onion family, the pearl onion is a tree onion (allium proliferum), which grows little bulblets where normal onions would have their flowers, above ground. They are also known as walking onions, because the heavy bulblets bend down to the ground as they grow. They are super-cute, but a bit daunting when you consider they need to be peeled. Thankfully, there is a trick, which you are about to learn. Blanch them. (Your welcome)
Drop the onions in boiling water for 30-60 seconds. Remove directly to ice water, and when cool, the skin pops right off.