Root vegetables are sadly underrated. The lowly unsung root is, in fact, a storehouse of nutrients, natural sugars, and starch, and a very healthy and flavorful substitute for the ubiquitous russet potato. It’s also a delicious and simple way to get your daily dose of vitamins during the cold weather season. A peel of the skin reveals a rainbow of anti-oxidant-rich colors ranging from magenta to ochre to buttery yellow, guaranteed to brighten a gray day – and your holiday table. I used sweet potato, celery root and rutabaga for this mash. You can add other roots, such as parsnip, carrot, and the handy russet potato to the mix as well. Be sure to choose a variety for a balance of sweetness and nutty creamy flavor.
I use a combo of sour cream and Greek yogurt in this mash, which creates a little naughty richness and a little tangy lightness. So long as you use a combined amount of 1 cup, you can opt for all of one or the other.
3 pounds mixed roots (such as 1 pound each of sweet potato, celery root, and rutabaga)
3 garlic cloves, minced
2 tablespoons unsalted butter
1/2 cup sour cream
1/2 cup whole milk Greek yogurt
Freshly ground black pepper
Peel the root vegetables and cut into 1-inch chunks. Place the vegetables in a large pot with 2 teaspoons salt and cover with cold water. Bring to a boil over high heat, then reduce the heat to medium and simmer until the vegetables are very tender. Drain the vegetables and return them to the pot; cool 5 minutes. Add the garlic, butter, sour cream, and yogurt. Smash with a potato masher until the ingredients are blended and the the mash is your desired consistency (I like mine a little chunky). Add salt to your taste and a generous amount of pepper. Spoon into a serving bowl and serve warm.
The mash may be prepared up to 1 day in advance of serving. Cool completely and transfer to a buttered, deep gratin dish. Cover and refrigerate for up to 24 hours. Remove from them refrigerator 1 hour before serving. To reheat, heat the oven to 325°F. Dot the top of the mash with about 1 tablespoon of diced butter and cover with foil. Bake in the oven until heated through, 30 to 40 minutes.