"Sage adds an earthy flavor to these mashed potatoes, parsnips lend sweetness, and sour cream brings a bit of tang. Prep and Cook Time: 1 hour. Notes: Parsnips look like cream-colored, fat, broad-shouldered carrots. They have a similar sweetness and a lovely nutty flavor. The center “core� of a parsnip tends to be tough and woody, however, so be sure to cut it out or the parsnips won't mash properly...."