If the outside skin of a vegetable is removed, it should be pared as thin as possible. The covering of the carrot and new potato is so thin that it can be removed by scraping, thereby saving the valuable nutritive substances just beneath the skin.
Turnips are an exception to the rule, a thick layer of cellular material covers them. For this reason, a thick paring is cut from turnips. (Cut a turnip in two and note the thickness of its skin.)