The phrase "to remove the peel" means taking off the outer layer or skin of something, like a fruit or vegetable, to expose the inside part that you want to eat or use. Full definition
It's possible to cut the cooking time in half if you peel and dice the beets into chunks, but I find it easier to simply roast then remove the peel afterward. (therisingspoon.com)
If you decide to give your dog a piece of banana, make sure to remove the peel first. (smartdogowners.com)