Sweet Potato and Turnip Gratin

Dinner, Entertaining, Holiday | November 23, 2014 | By

Sweet Potato and Turnip Gratin1

If you still haven’t finished up your menu for Thanksgiving or you’re supposed to bring a side and you haven’t decided what to bring yet, this one is perfect!  Sweet potatoes are classic Thanksgiving fare but this recipe adds earthy turnips to the mix which is unexpected but oh so good!  The addition of Gruyère cheese and white wine elevate it to special occasion status but it’s easy enough to make anytime! 

Sweet Potato and Turnip Gratin3

Take care to slice the sweet potatoes and turnips no more than 1/4 inch thick.  I tried my mandoline but found the slices were way to thin so I used a sharp knife instead.  Be sure to salt and pepper and add flour to each layer.  Gently pour over the chicken broth and wine, cover with foil and bake.  Add the cheese after the potatoes are tender and brown in the oven, it’s that simple!  If you’re feeding more than six  you may want to double this recipe and bake it in a 13 x 9 pan.  You will definitely want to taste the potatoes to make sure they are tender before adding the cheese.  I needed a full hour in the oven to get mine tender. 

Sweet Potato and Turnip Gratin2

If you make this, let me know what you thought!  Tom taste-tested this for me about a half hour ago…he’s now sleeping!  He taste-tested A LOT of it so I think that means he liked it! 🙂

Sweet Potato and Turnip Gratin
Serves 6
Sweet potatoes and earthy turnips are perfect partners in this festive side dish. Gruyere cheese and white wine elevate it to special occasion status.
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Prep Time
20 min
Total Time
1 hr 30 min
Prep Time
20 min
Total Time
1 hr 30 min
  1. 1 1/2 pounds turnips (about 3 medium), peeled and cut into 1/4-inch-thick rounds
  2. Salt and ground pepper
  3. 1/4 cup all-purpose flour
  4. 1 pound sweet potatoes (about 2 medium), peeled and cut into 1/4-inch-thick rounds
  5. 2 tablespoons unsalted butter, cut into pieces
  6. 3/4 cup low-sodium chicken or vegetable broth
  7. 1/4 cup dry white wine, such as Sauvignon Blanc
  8. 1 cup grated Gruyere cheese (4 ounces)
  1. Preheat oven to 350 degrees.
  2. In an 8-inch square baking dish, arrange a single layer of turnips and sweet potatoes, overlapping slightly.
  3. Season with salt and pepper and sprinkle with one-third of the flour.
  4. Repeat to make three more layers, sprinkling with salt, pepper, and flour between layers.
  5. Dot top layer with butter, then slowly pour broth and wine into dish, keeping layers intact.
  6. Cover with foil and bake until vegetables are tender when pierced with a knife, 45 minutes to an hour, taste to be sure the potatoes and turnips are tender before adding the cheese.
  7. Increase oven temperature to 425 degrees.
  8. Remove foil and sprinkle cheese over dish.
  9. Bake until cheese is golden and bubbling, 12 to 15 minutes.
  10. Let gratin sit 10 minutes before serving.
Adapted from Martha Stewart
Adapted from Martha Stewart
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