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Sweet Potato Gratin with Prunes
© Maura McEvoy

Sweet Potato Gratin with Prunes

  • SERVINGS: 12
  • MAKE-AHEAD
  • VEGETARIAN

By using sweet potatoes instead of white ones, Scott Howell puts a Southern spin on this French-inspired gratin.

Plus: More Vegetable Recipes and Tips

  1. 2 tablespoons unsalted butter
  2. 1 1/2 pounds medium leeks, white and tender green parts, halved lengthwise and thinly sliced crosswise
  3. 2 tablespoons chopped thyme
  4. Salt and freshly ground pepper
  5. 2 cups heavy cream
  6. 1/2 pound plump pitted prunes
  7. 6 pounds sweet potatoes
  1. Preheat the oven to 350°. Butter a 4-quart glass or ceramic baking dish. Melt the butter in a large saucepan. Add the leeks and thyme and season with salt and pepper. Cover and cook over moderate heat until the leeks soften, about 5 minutes. Uncover and cook until any liquid has evaporated. Add the cream and bring to a boil, then remove from the heat.
  2. Spread the prunes between sheets of plastic wrap and use a rolling pin or meat pounder to flatten them to a 1/4-inch thickness. Peel the sweet potatoes and slice them 1/8 inch thick. Strain the leeks, reserving the cream.
  3. In a large bowl, toss three-fourths of the sliced sweet potatoes with the leeks and prunes and season with salt and pepper. Spread the sweet potatoes in the prepared baking dish and arrange the remaining sweet potato slices on top in a decorative pattern. Pour the reserved leek cream evenly over the sweet potatoes.
  4. Cover the potatoes with buttered parchment paper and then foil and bake for 45 minutes. Uncover, press the sweet potato layers down slightly and bake, uncovered, for 45 minutes longer, or until the sweet potatoes are tender, bubbling and golden brown.
Make Ahead The recipe can be prepared through Step 3 and refrigerated overnight. Bring to room temperature before baking.
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