In this video, you’ll see how to make a simple mashed vegetable side dish. Celery root, or celeriac, is simply boiled until tender and then mashed with sour cream and a little dill. It's so easy! And a delicious change of pace from mashed potatoes—the celeriac has a wonderfully subtle, mild flavor. Watch the video, then get the 5-star recipe for Creamy Celery Root Mash. Try it alongside roasted meats or broiled fish.