Holiday Sides: Root Vegetable Gratin

~ Root Vegetable Gratin with Sweet Potato, Red Potato and Rutabaga ~

My cheese and potato loving family loves a good gratin. I use a simple method of layering thinly sliced potatoes with a rich garlic infused sour cream and shredded Gruyere cheese. Simple and, yes, decadent. I switched up my go-to recipe recently when I wanted something more flavorful and nutrient-rich than white spuds. Thinly sliced rutabaga (also known as Swede) and sweet potato were included in the mix, and I switched out the white potatoes for red, which tend to hold their shape more while cooking. The result was a colorfully striated gratin, flecked with sage and thyme, adding their earthy fragrance to the sweet and nutty root vegetables. This is a wonderful side dish, and makes a rustic and festive addition to any holiday table.

Root Vegetable Gratin

Feel free to mix up the root vegetables to your taste. In all there should be about 3 pounds of vegetables.

Serves 8

16 ounces full fat sour cream
1 large garlic clove, minced
2 teaspoons minced fresh sage leaves
2 teaspoons fresh thyme leaves
1 teaspoon salt
1 teaspoon freshly ground black pepper
1/4 teaspoon ground nutmeg
4 medium-large red potatoes, about 1 1/2 pounds
1 large sweet potato, peeled, about 3/4 pound
1 medium rutabaga, peeled, about 3/4 pound
6 ounces Gruyère cheese, finely grated
1/3 cup heavy cream, or to taste

Preheat oven to 375 F (190 C). Butter an 8 by 10-inch gratin dish.
Whisk the sour cream, garlic, sage, thyme, salt, pepper and nutmeg in a bowl and mix well.
Thinly slice the potatoes and rutabaga, preferably with a mandoline. Arrange half of the red potatoes, overlapping, in the bottom of the gratin dish (there will be about 2 layers). Spread 1/4 of the sour cream over the potatoes and sprinkle with 1/4 of the Gruyere. Cover with the sweet potatoes, overlapping in about 2 layers. Spread with 1/4 of the sour cream and 1/4 of the gruyere. Repeat with the rutabaga, more sour cream and gruyere. Finish with the remaining red potatoes, sour cream and gruyere. Drizzle some of the cream around the edges and in the corners of the gratin without overfilling.
Bake in oven until vegetables are tender and the top of the gratin is brown and bubbling, about 1 hour and 15 minutes. (Loosely cover gratin with buttered foil if browning too fast.) Serve hot.