In this video, you’ll see how to make a creamy, cheesy gratin using potatoes and assorted root vegetables like parsnips, turnips, rutabaga, and celery root. Chef John will show you how to prepare all the vegetables. If you have a mandolin, break it out for this recipe so you can get nice, uniform slices without sweating it out with a knife. Then you’ll see how to make a cream sauce with fresh nutmeg, garlic, fresh thyme, and a little stock for a lighter gratin. Watch the video, then get the recipe for Chef John’s Chef John’s Root Vegetable Gratin. This root veggie side dish is the perfect companion for roast meats at any time of year; and it’s a holiday favorite for Thanksgiving and Christmas dinners.