An easy, sophisticated puree of celery root and potatoes. Unbelievably creamy and delicious and completely make-ahead. A great option for elegant and effortless entertaining!
4 large russet potatoes, peeled and cut into 1 ½ inch chunks
2 large celery roots, peeled and cut into 1 inch chunks
½ onion, quartered
4 cups water
4 cups whole milk
1 tablespoon coarse salt, plus more to taste
8 tablespoons (1 stick) unsalted butter
Freshly ground pepper
Transfer half of the potatoes and celery root to a food processor along with 4 tablespoons of butter. Process until smooth and transfer to a serving bowl. Repeat with remaining potatoes, celery root and butter. Season to taste with salt and pepper. Serve. (Puree can be prepared a day ahead and reheated in the microwave or on the stovetop just before serving).
This recipe can easily be halved for a smaller crowd.
Keywords: celery root, celeriac, potatoes, puree, mashed potatoes, easy side dish, make ahead side dish, root vegetable mash